Halogen Substituted  Heteroatom-Containing  Metallocene Compounds for Olefin Polymerization

ABSTRACT

Halogen substituted metallocene compounds are described and comprise one or more monocyclic or polycyclic ligands that are pi-bonded to the metal atom and include at least one halogen substituent directly bonded to an sp 2  carbon atom at a bondable ring position of the ligand, wherein the or at least one ligand has one or more ring heteroatoms in its cyclic structure. When combined with a suitable activator, these compounds show activity in the polymerization of olefins, such as ethylene and propylene.

This application is a divisional of Ser. No. 12/951,814, filed Nov. 22, 2010 which is a divisional of U.S. Ser. No. 11/300,240, filed Dec. 14, 2005.

FIELD

This invention relates to halogen substituted heteroatom-containing metallocene compounds and their use in catalyst systems for olefin polymerization.

BACKGROUND

Various processes and catalysts exist for the homopolymerization or copolymerization of olefins. For many applications, it is desirable for a polyolefin to have a high weight average molecular weight while having a relatively narrow molecular weight distribution. A high weight average molecular weight, when accompanied by a narrow molecular weight distribution, provides a polyolefin with high strength properties.

Traditional Ziegler-Natta catalysts systems comprise a transition metal compound co-catalyzed by an aluminum alkyl and are typically capable of producing polyolefins having a high molecular weight, but with a broad molecular weight distribution.

More recently metallocene catalyst systems have been developed wherein the transition metal compound has one or more cyclopentadienyl, indenyl or fluorenyl ring ligands (typically two). Metallocene catalyst systems, when activated with cocatalysts, such as alumoxane, are effective to polymerize monomers to polyolefins having not only a high weight average molecular weight but also a narrow molecular weight distribution.

Also known are metallocene compounds comprising ligands with cyclopentadienyl-containing ring structures in which the ring structure contains one or more heteroatoms. For example, U.S. Pat. No. 5,434,116 and PCT Publication No. WO95/04087 discuss catalyst compositions comprising heterocyclopentadienyl ligands, where one of the carbon atoms in a cyclopentadienyl ligand has been replaced with a group 15 heteroatom. U.S. Pat. No. 5,489,659 discusses metallocenes which comprise two bridged cyclopentadienyl groups, each of which is bonded to the metal, wherein at least one of the cyclopentadienyl groups is substituted with a ring system which comprises a silicon-containing hydrocarbon group.

In addition, U.S. Pat. No. 6,451,938 discloses a polymerization catalyst system comprising a catalytic complex formed by activating a transition metal compound; wherein the transition metal compound is represented by the formula:

{[L′]_(q)}_(m){T}{[JR_(y)]_(p)}_(n)M[A]₂

wherein: a) M is a Group 3, 4, 5, 6, 7, 8, 9, or 10 metal; b) L′ is a substituted or unsubstituted stabilizing ligand, at least one L′ is a heterocyclic fused ring cyclopentadienide ligand having a C₅ cyclopentadienide moiety and one or more fused-ring heterocycles in which at least one heteroatom is selected from Group 13, 15, or 16 elements; c) J is a group 15 or 16 heteroatom having a formal negative charge bonded to M; d) R is a substitutent bonded to J; e) y has a value of zero, 10 or 2 as necessary to complete the valency of J; f) T is an optional bridging group that bridges L′ and J; g) A is a monatomic or polyatomic ligand, other than a cyclopentadienide-containing ligand, which bears a formal negative charge of one and can be the same as or different from any other A; h) q and p are integers representing the formal charge on the substituted or unsubstituted stabilizing ligand L′ and JR_(y), respectively; and i) m is an integer equal to 10 or 2 and n is an integer equal to 0, 1, or 2 and are chosen such that (M×q)+(n×p)=(s−2), where s is the Group number of M. Ethylene polymerizations or copolymerizations with dimethyl (η5-pentamethylcyclopentadienyl)(1-azaindenyl) zirconium and bis(5-methyl-cyclopenta[b]thiophene) zirconium dichloride, activated by tris(pentafluorophenyl) boron and methylalumoxane, respectively, are illustrated.

Metallocenes containing substituted, bridged indenyl derivatives are noted for their ability to produce isotactic propylene polymers having high isotacticity and narrow molecular weight distribution. Considerable effort has been made toward obtaining metallocene produced propylene polymers having ever-higher molecular weight and melting point, while maintaining suitable catalyst activity. Researchers currently believe that there is a direct relationship between the way in which a metallocene is substituted, and the molecular structure of the resulting polymer. For the substituted, bridged indenyl type metallocenes, it is believed that the type and arrangement of substituents on the indenyl groups, as well as the type of bridge connecting the indenyl groups, determines such polymer attributes as molecular weight and melting point. Unfortunately, it is impossible at this time to accurately correlate specific substitution patterns with specific polymer attributes, though minor trends may be identified, from time to time.

For example, U.S. Pat. No. 5,840,644 describes certain metallocenes containing aryl-substituted indenyl derivatives as ligands, which are said to provide propylene polymers having high isotacticity, narrow molecular weight distribution and very high molecular weight.

Likewise, U.S. Pat. No. 5,936,053 describes certain metallocene compounds said to be useful for producing high molecular weight propylene polymers. These metallocenes have a specific hydrocarbon substituent at the 2 position and an unsubstituted aryl substituent at the 4 position, on each indenyl group of the metallocene compound.

Also known in the art are unbridged indenyl based metallocenes having bulky substituents on the indenyl ligand, thus providing “fluxionality” to the activated catalyst. Metallocenes of this type are believed to produce “elastomeric” polypropylene. Science, 1995, 267, 217; WO 95/25757; and Organometallics, 1997, 16, 3635 discuss such catalysts.

In addition to hydrocarbon substituents, it is also known to include halogen substituents on metallocene compounds. For example, U.S. Pat. No. 3,678,088 discloses polychlorinated metallocenes having formulae C₅H₅S_(m)Cl_(m)MC₅H₅ and (C₅H_(5-n)Cl_(n))₂M wherein M is iron, ruthenium or osmium, m is an integer from 3 to 5, inclusive and n is an integer from 2 to 5, inclusive. There is no disclosure of the polychlorinated metallocenes being used as olefin polymerization catalysts.

Similarly, chlorinated metallocenes including (CpCl)₂TiCl₂, (CpCl)(Cp)TiCl₂, (CpCl)₂TiClMe, and (CpCl)(Cp)TiClMe are disclosed in J. Am. Chem. Soc. 1988, 110, 2406; J. Organometallic Chem. 1988, 358, 161; Organometallics 1985, 4, 688 and Electrochimica Acta, 1995, 40, 473.

U.S. Pat. Nos. 5,504,232, 5,763,542 and 6,087,292 disclose olefin polymerization catalysts based on bridged halogen substituted indenyls of Groups 4-6, such as Zr and Hf. Particularly exemplified are rac-dimethylsilanediylbis(5(6)-fluoroindenyl) zirconium dichloride (F mixed in 5 and 6 positions), rac-dimethylsilanediylbis(5-chloroindenyl)zirconium dichloride, rac-dimethylsilanediyl bis(4(7)-fluoroindenyl) zirconium dichloride (F mixed in 4 and 7 positions), and rac-dimethylsilanediylbis(5,6-dichloroindenyl)zirconium dichloride.

JP1999-080183A discloses halogenated substituents on racemic carbon bridged bis-indenyl Group 4 transition metal complexes. The application focuses on the use of these complexes as pre-catalysts for the copolymerization of vinyl aromatic monomers (styrene). The only complexes exemplified are isopropylidene-bis(5- or 6-fluoroindenyl) zirconium bisdimethylamide, isopropylidene-bis(5- or 6-fluoroindenyl) zirconium dichloride, isopropylidene-bis(5-chloroindenyl) zirconium bisdimethylamide, and isopropylidene-bis(5-chloroindenyl) zirconium dichloride. The application gives preference to F>Cl>Br.

JP1995-216011A discloses olefin polymerization catalysts comprising bridged bis-indenyl Group 4-6 transition metal complexes, having halogen substituents either in the 2 or the 7 position on the indene ring. However, the only complexes exemplified are bridged bis-indenyl complexes having a fluoro- or chloro-substituent at the 7 position and a hydrocarbyl or substituted hydrocarbyl substituent at the 4 position.

U.S. Patent Application Publication No. 2004/0260107, published Dec. 23, 2004, discloses a large number of bridged indenyl substituted cyclopentadienyl complexes of Group 3 to 6 metals and indicates that the complexes are useful as olefin polymerization catalysts. Among the complexes specifically disclosed, but not synthesized, are dimethylsilanediyl(2-methyl-4-phenyl-7-chloroindenyl)(2-isopropyl-4-phenylindenyl)zirconium dichloride, dimethylsilanediyl(2-methyl-4-phenyl-7-bromoindenyl)(2-isopropyl-4-phenylindenyl)zirconium dichloride, dimethylsilanediyl (2-methyl-4-(1-naphthyl)-7-chloroindenyl)(2-isopropyl-4-(1-naphthyl)indenyl) zirconium dichloride, dimethylsilanediyl(2-methyl-4-(1-naphthyl)-7-bromoindenyl) (2-isopropyl-4-(1-naphthyl)indenyl)zirconium dichloride, dimethylsilanediyl(2-methyl-4-(p-t-butylphenyl)-7-chloroindenyl)(2-isopropyl-4-(p-t-butylphenyl)indenyl) zirconium dichloride and dimethylsilanediyl(2-methyl-4-(p-t-butylphenyl)-7-bromoindenyl)(2-isopropyl-4-(p-t-butylphenyl)indenyl)zirconium dichloride.

U.S. Patent Application Publication No. 2002/0193535 discloses a process for polymerizing propylene in the presence of a Group 3-5 transition metal catalyst having two indenoindolyl ligands, wherein the term “indenoindole” is defined to mean an organic compound that has both indole and indene rings in which the five-membered rings from each are fused. The indenoindole rings can be substituted with a variety of moieties, including halogen, and specifically disclosed and exemplified is bis(2-chloro-5-phenyl-5,10-dihydroindeno[1,2-b]-indolyl)zirconium dichloride.

Fluorinated bisindenyl metallocenes, particularly bis(4,7-difluoroindenyl) zirconium dichloride and bis(4,7-difluoroindenyl)zirconium dibenzyl, and their use in olefin polymerization are discussed in Organometallics, 1990, 9, 3098.

Brominated fluorenylcyclopentadienyl metallocenes, particularly (2,7-dibromofluorenyl)(cyclopentadienyl)zirconium dichloride, (2,7-dibromofluorenyl) (cyclopentadienyl)zirconium dimethyl and (2-bromofluorenyl)(cyclopentadienyl) zirconium dichloride, and their use in olefin polymerization are discussed in J. Organometallic Chem., 1995, 501, 101.

Since the effects of various substituents on the polymerization properties of metallocene catalysts is still largely an empirical matter; there is a continued interest in synthesizing and testing new metallocene structures.

SUMMARY

In one aspect, the invention resides in a metallocene compound represented by the formula (1):

AMX_(n-1)

wherein: M is a transition metal atom having a coordination number of n selected from Group 3, 4, 5 or 6 of the Periodic Table of Elements, or a lanthanide metal atom, or actinide metal atom; A is a substituted monocyclic or polycyclic ligand that is pi-bonded to M and is substituted with at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position of the ligand, wherein said ligand also includes one or more ring heteroatoms selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; and the or each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand.

Conveniently, A is a substituted heterocyclopentadienyl ligand, a substituted heteroindenyl ligand, a substituted heterofluorenyl ligand, or a substituted heterocyclopentanaphthyl ligand.

In a further aspect, the invention resides in a metallocene compound represented by the formula (2):

wherein M is a Group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; each A is, independently, a substituted or unsubstituted monocyclic or polycyclic ligand pi-bonded to M, wherein at least one A includes at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position of the ligand, and wherein each A further includes one or more ring heteroatoms, wherein the or each heteroatom is selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; Y is an optional bridging group that is bonded to each A, and is present when y is one and absent when y is zero; y is zero or one; and each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand; provided that each A is not a substituted or unsubstituted indeno[1,2-b]indolyl ligand.

Conveniently, A contains an aromatic five-membered ring pi-bonded to M. Preferably, A is a substituted or unsubstituted heterocyclopentadienyl ligand, a substituted or unsubstituted heteroindenyl ligand, a substituted or unsubstituted heterofluorenyl ligand, or a substituted or unsubstituted heterocyclopentanaphthyl ligand.

In yet a further aspect, the invention resides in a metallocene compound represented by the formula (3):

wherein M is a Group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; A is a substituted or unsubstituted monocyclic or polycyclic ligand pi-bonded to M, wherein A includes one or more ring heteroatoms selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; E is a substituted or unsubstituted monocyclic or polycyclic arenyl ligand pi-bonded to M at least one of A and E includes at least one halogen substituent directly bonded to an sp² carbon atom at a bondable ring position of the ligand; Y is an optional bridging group that is bonded to E and A, and is present when y is one and absent when y is zero; y is zero or one; and each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand.

In one embodiment, A contains an aromatic five-membered ring pi-bonded to M. Preferably, A is a substituted or unsubstituted heterocyclopentadienyl ligand, a substituted or unsubstituted heteroindenyl ligand, a substituted or unsubstituted heterofluorenyl ligand, or a substituted or unsubstituted heterocyclopentanaphthyl ligand. Conveniently, A includes at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position.

Conveniently, E is a substituted or unsubstituted cyclopentadienyl ligand, a substituted or unsubstituted indenyl ligand, a substituted or unsubstituted fluorenyl ligand, or a substituted or unsubstituted cyclopentanaphthyl ligand. Conveniently, E includes at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position.

In still yet a further aspect, the invention resides in a metallocene compound represented by the formula (4):

wherein M is a Group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; A is a substituted monocyclic or polycyclic ligand that is pi-bonded to M and is substituted with at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position of the ligand, wherein A includes one or more ring heteroatoms selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; Y is an optional bridging group that is bonded to A and T, and is present when y is one and absent when y is zero; y is zero or one; and T is a heteroatom with a coordination number of three from Group 15 or with a coordination number of two from Group 16 of the Periodic Table of Elements; R″ is selected from a C₃-C₁₀₀ substituted or unsubstituted monocyclic or polycyclic ring structure substituent that is partially unsaturated, unsaturated or aromatic; or a C₂-C₁₀₀ substituted or unsubstituted, unsaturated or partially unsaturated, linear or branched alicyclic hydrocarbyl substituent; or a C₁-C₁₀₀ substituted or unsubstituted saturated hydrocarbyl radical; t is the coordination number of the heteroatom T where “t-1-y” indicates the number of R″ substituents bonded to T; and each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand.

Preferably, R″ is selected from methyl, ethyl, all propyl isomers, all butyl isomers, phenyl, benzyl, phenethyl, 1-adamantyl, cyclododecyl, cyclohexyl and norbornyl.

In another aspect, the invention resides in a metallocene compound represented by the formula (5):

wherein M is a Group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; A is a substituted or unsubstituted monocyclic or polycyclic ligand pi-bonded to M, wherein A includes one or more ring heteroatoms selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; Y is an optional bridging group that is bonded to A and T, and is present when y is one and absent when y is zero; y is zero or one; and T is a heteroatom with a coordination number of three from Group 15 or with a coordination number of two from Group 16 of the Periodic Table of Elements; R′″ is selected from a C₃-C₁₀₀ substituted monocyclic or polycyclic ring structure substituent that is partially unsaturated, unsaturated or aromatic; or a C₂-C₁₀₀ substituted, unsaturated or partially unsaturated, linear or branched alicyclic hydrocarbyl substituent; and R′″ is substituted with at least one halogen substituent bonded to a sp² carbon atom; t is the coordination number of the heteroatom T where “t-1-y” indicates the number of R′″ substituents bonded to T and is at least one; each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand.

Preferably, R′″ is a halogen substituted radical of any of the following groups: phenyl, benzyl, phenethyl, and all isomers of methylphenyl, dimethylphenyl, trimethylphenyl, diethylphenyl, dipropylphenyl, and dibutylphenyl, and cylcohexenyl.

Conveniently, A includes an aromatic five-membered ring pi-bonded to M. Preferably, A is a substituted heterocyclopentadienyl ligand, a substituted heteroindenyl ligand, a substituted heterofluorenyl ligand, or a substituted heterocyclopentanaphthyl ligand.

Conveniently, t-1-y is equal to 1 and T is preferably nitrogen.

In one embodiment, Y is present and is a bridging group containing boron or a Group 14, 15 or 16 element.

Preferably, the or each halogen substituent is chloro, bromo or iodo, and more preferably is chloro or bromo.

In yet another aspect, the invention resides in an olefin polymerization catalyst system comprising (a) a metallocene compound represented by one of the formulas (1) to (5) and (b) an activator.

In still another aspect, the invention resides in an olefin polymerization process comprising contacting at least one olefin with the olefin polymerization catalyst system described herein.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a representation of the molecular structure of the (η⁵-3-bromo-5-methylcyclopenta[b]thienyl)(η⁵-pentamethylcyclopentadienyl)zirconium dichloride of Example 1.

FIG. 2 illustrates the ¹H NMR (CD₂Cl₂) for the dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,6-dimethyl-4-bromophenylamido))zirconium dichloride of Example 10.

DEFINITIONS

As used herein, the numbering scheme for the Periodic Table Groups is the new notation as set out in CHEMICAL AND ENGINEERING NEWS, 63(5), 27 (1985). However, For purposes of this invention and the claims thereto the use of the capital letter Y in a formula herein is NOT meant to indicate yttrium.

As used herein, Me is methyl, t-Bu and ^(t)Bu are tertiary butyl, iPr and ^(i)Pr are isopropyl, Cy is cyclohexyl, THF (thf) is tetrahydrofuran, and Ph is phenyl.

The terms “hydrocarbyl radical,” “hydrocarbyl” and “hydrocarbyl group” are used interchangeably throughout this document. Likewise the terms “group”, “radical”, and “substituent” are also used interchangeably in this document. For purposes of this disclosure, “hydrocarbyl radical” is defined to be a radical, which contains hydrogen atoms and up to 100 carbon atoms and which may be linear, branched, or cyclic, and when cyclic, aromatic or non-aromatic.

Substituted hydrocarbyl radicals are radicals in which at least one hydrogen atom has been substituted with at least one functional group such as NR*₂, OR*, SeR*, TeR*, PR*₂, AsR*₂, SbR*₂, SR*, BR*₂, SiR*₃, GeR*₃, SnR*₃, PbR*₃ and the like or where at least one non-hydrocarbon atom or group has been inserted within the hydrocarbyl radical, such as —O—, —S—, —Se—, —Te—, —N(R*)—, ═N—, —P(R*)—, ═P—, —As(R*)—, ═As—, —Sb(R*)—, ═Sb—, —B(R*)—, ═B—, —Si(R*)₂—, —Ge(R*)₂—, —Sn(R*)₂—, —Pb(R*)₂— and the like, where R* is independently a hydrocarbyl or halocarbyl radical, and two or more R* may join together to form a substituted or unsubstituted saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure.

Halocarbyl radicals are radicals in which one or more hydrocarbyl hydrogen atoms have been substituted with at least one halogen (e.g. F, Cl, Br, I) or halogen-containing group (e.g. CF₃).

Substituted halocarbyl radicals are radicals in which at least one halocarbyl hydrogen or halogen atom has been substituted with at least one functional group such as NR*₂, OR*, SeR*, TeR*, PR*₂, AsR*₂, SbR*₂, SR*, BR*₂, SiR*₃, GeR*₃, SnR*₃, PbR*₃ and the like or where at least one non-carbon atom or group has been inserted within the halocarbyl radical such as —O—, —S—, —Se—, —Te—, —N(R*)—, ═N—, —P(R*)—, ═P—, —As(R*)—, ═As—, —Sb(R*)—, ═Sb—, —B(R*)—, ═B—, —Si(R*)₂—, —Ge(R*)₂—, —Sn(R*)₂—, —Pb(R*)₂— and the like, where R* is independently a hydrocarbyl or halocarbyl radical provided that at least one halogen atom remains on the original halocarbyl radical. Additionally, two or more R* may join together to form a substituted or unsubstituted saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure.

Silylcarbyl radicals (also called silylcarbyls) are groups in which the silyl functionality is bonded directly to the indicated atom or atoms. Examples include SiH₃, SiH₂R*, SiHR*₂, SiR*₃, SiH₂ (OR*), SiH(OR*)₂, Si(OR*)₃, SiH₂ (NR*₂), SiH(NR*₂)₂, Si(NR*₂)₃, and the like where R* is independently a hydrocarbyl or halocarbyl radical and two or more R* may join together to form a substituted or unsubstituted saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure.

Germylcarbyl radicals (also called germylcarbyls) are groups in which the germyl functionality is bonded directly to the indicated atom or atoms. Examples include GeH₃, GeH₂R*, GeHR*₂, GeR*₃, GeH₂ (OR*), GeH(OR*)₂, Ge(OR*)₃, GeH₂ (NR*₂), GeH(NR*₂)₂, Ge(NR*₂)₃, and the like where R* is independently a hydrocarbyl or halocarbyl radical and two or more R* may join together to form a substituted or unsubstituted saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure.

Polar radicals, functional groups, or polar groups are groups in which a heteroatom functionality is bonded directly to the indicated atom or atoms. They include heteroatoms of Groups 1-17 of the periodic table either alone or connected to other elements by covalent or other interactions such as ionic, van der Waals forces, or hydrogen bonding. Examples of functional groups include carboxylic acid, acid halide, carboxylic ester, carboxylic salt, carboxylic anhydride, aldehyde and their chalcogen (Group 14) analogues, alcohol and phenol, ether, peroxide and hydroperoxide, carboxylic amide, hydrazide and imide, amidine and other nitrogen analogues of amides, nitrile, amine and imine, azo, nitro, other nitrogen compounds, sulfur acids, selenium acids, thiols, sulfides, sulfoxides, sulfones, sulfonates, phosphines, phosphates, other phosphorus compounds, silanes, boranes, borates, alanes, aluminates. Functional groups may also be taken broadly to include organic polymer supports or inorganic support material such as alumina, and silica. Preferred examples of polar groups include NR*₂, OR*, SeR*, TeR*, PR*₂, AsR*₂, SbR*₂, SR*, BR*₂, SnR*₃, PbR*₃ and the like where R* is independently a hydrocarbyl, substituted hydrocarbyl, halocarbyl or substituted halocarbyl radical as defined above and two R* may join together to form a substituted or unsubstituted saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure. Also preferred are sulfonate radicals, S(═O)₂OR*, where R* is defined as above. Examples include SO₃Me (mesylate), SO₃(4-tosyl) (tosylate), SO₃CF₃ (triflate), SO₃(n-C₄F₉) (nonaflate) and the like.

In using the terms “substituted or unsubstituted cyclopentadienyl ligand”, “substituted or unsubstituted heterocyclopentadienyl ligand”, “substituted or unsubstituted heterophenyl ligand”, “substituted or unsubstituted pentalenyl ligand”, “substituted or unsubstituted heteropentalenyl ligand”, “substituted or unsubstituted cyclopentapentalenyl ligand”, “substituted or unsubstituted heterocyclopentapentalenyl ligand”, “substituted or unsubstituted indenyl ligand”, “substituted or unsubstituted heteroindenyl ligand”, “substituted or unsubstituted cyclopentaindenyl ligand”, “substituted or unsubstituted heterocyclopentaindenyl ligand”, “substituted or unsubstituted fluorenyl ligand”, “substituted or unsubstituted heterofluorenyl ligand”, “substituted or unsubstituted cyclopentanaphthyl ligand”, “substituted or unsubstituted heterocyclopentanaphthyl ligand, “substituted or unsubstituted cyclopentapentalenyl ligand”, “substituted or unsubstituted benzocyclopentaindenyl ligand”, “substituted or unsubstituted heterobenzocyclopentaindenyl ligand”, “substituted or unsubstituted pentadienyl ligand”, “substituted or unsubstituted allyl ligand”, “substituted or unsubstituted boratabenzene ligand”, “substituted or unsubstituted monocyclic ligand”, “substituted or unsubstituted monocyclic arenyl ligand”, “substituted or unsubstituted polycyclic ligand”, or “substituted or unsubstituted polycyclic arenyl ligand”, the substitution to the aforementioned ligand is on a bondable ring position, and each occurrence is selected from hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, a halogen radical, or a polar group.

In some embodiments, the hydrocarbyl radical is independently selected from methyl, ethyl, ethenyl and isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, propynyl, butynyl, pentynyl, hexynyl, heptynyl, octynyl, nonynyl, decynyl, undecynyl, dodecynyl, tridecynyl, tetradecynyl, pentadecynyl, hexadecynyl, heptadecynyl, octadecynyl, nonadecynyl, eicosynyl, heneicosynyl, docosynyl, tricosynyl, tetracosynyl, pentacosynyl, hexacosynyl, heptacosynyl, octacosynyl, nonacosynyl, triacontynyl, butadienyl, pentadienyl, hexadienyl, heptadienyl, octadienyl, nonadienyl, and decadienyl. Also included are isomers of saturated, partially unsaturated and aromatic cyclic and polycyclic structures wherein the radical may additionally be subjected to the types of substitutions described above. Examples include phenyl, methylphenyl, dimethylphenyl, ethylphenyl, diethylphenyl, propylphenyl, dipropylphenyl, benzyl, methylbenzyl, naphthyl, anthracenyl, cyclopentyl, cyclopentenyl, cyclohexyl, cyclohexenyl, methylcyclohexyl, cycloheptyl, cycloheptenyl, norbornyl, norbornenyl, adamantyl and the like. For this disclosure, when a radical is listed, it indicates that radical type and all other radicals formed when that radical type is subjected to the substitutions defined above. Alkyl, alkenyl and alkynyl radicals listed include all isomers including where appropriate cyclic isomers, for example, butyl includes n-butyl, 2-methylpropyl, 1-methylpropyl, tert-butyl, and cyclobutyl (and analogous substituted cyclopropyls); pentyl includes n-pentyl, cyclopentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 1-ethylpropyl, and neopentyl (and analogous substituted cyclobutyls and cyclopropyls); butenyl includes E and Z forms of 1-butenyl, 2-butenyl, 3-butenyl, 1-methyl-1-propenyl, 1-methyl-2-propenyl, 2-methyl-1-propenyl and 2-methyl-2-propenyl (and cyclobutenyls and cyclopropenyls). Cyclic compound having substitutions include all isomer forms, for example, methylphenyl would include ortho-methylphenyl, meta-methylphenyl and para-methylphenyl; dimethylphenyl would include 2,3-dimethylphenyl, 2,4-dimethylphenyl, 2,5-dimethylphenyl, 2,6-diphenylmethyl, 3,4-dimethylphenyl, and 3,5-dimethylphenyl.

For nomenclature purposes, the following numbering schemes are used for cyclopentadienyl, indenyl, fluorenyl and cyclopentanaphthyl (also termed benzindenyl). It should be noted that indenyl can be considered as cyclopentadienyl with fused benzene ring. Analogously, fluorenyl can be considered as indenyl with a fused benzene ring. Each structure below is drawn and named as an anion.

A similar numbering and nomenclature scheme is used for heterocyclopentadienyls, heterophenyls, heteropentalenyls, heterocyclopentapentalenyls, heteroindenyls, heterofluorenyls, heterocyclopentanaphthyls, heterocyclopentaindenyls, heterobenzocyclopentaindenyls, and the like, as illustrated below. Each structure is drawn and named as an anion.

Non-limiting examples of heterocyclopentadienyls include:

Further non-limiting examples of heterocyclopentadienyls include 1,3-diazacyclopentadienyl, 1,3-diphosphacyclopentadienyl, 1,3-diarsacyclopentadienyl, 1,3-distibacyclopentadienyl, 1,3-diboracyclopentadienyl, 1,3-azaphosphacyclopentadienyl, 1,3-azaarsacylcopentadienyl, 1,3-azastibacyclopentadienyl, 1,3-azaboracyclopentadienyl, 1,3-arsaphosphacyclopentadienyl, 1,3-arsastibacyclopentadienyl, 1,3-arsaboracyclopentadienyl, 1,3-boraphosphacyclopentadienyl, 1,3-borastibacylcopentadienyl, 1,3-phosphastibacyclopentadienyl, 1,2-diazacyclopentadienyl, 1,2-diphosphacyclopentadienyl, 1,2-diarsacyclopentadienyl, 1,2-distibacyclopentadienyl, 1,2-diboracyclopentadienyl, 1,2-azaphosphacyclopentadienyl, 1,2-azaarsacylcopentadienyl, 1,2-azastibacyclopentadienyl, 1,2-azaboracyclopentadienyl, 1,2-arsaphosphacyclopentadienyl, 1,2-arsastibacyclopentadienyl, 1,2-arsaboracyclopentadienyl, 1,2-boraphosphacyclopentadienyl, 1,2-borastibacylcopentadienyl, 1,2-phosphastibacyclopentadienyl, 3-dihydrocarbylamino-1,3-azaborollide, 2-dihydrocarbylamino-1,2-oxaborollide, 2-dihydrocarbylamino-1,2-thiaborollide, 3-hydrocarbyloxy-1,3-azaborollide, 2-hydrocarbyloxy-1,2-oxaborollide, 2-hydrocarbyloxy-1,2-thiaborollide, 3-hydrocarbyl-1,3-azaborollide, 2-hydrocarbyl-1,2-oxaborollide, and 2-hydrocarbyl-1,2-thiaborollide, where hydrocarbyl is a “hydrocarbyl radical” as previously defined.

Non-limiting examples of heterophenyls include:

Further non-limiting examples of heterophenyls include 1-dihydrocarbylaminoboratabenzene, 4-dihydrocarbylamino-1,4-phosphaboratabenzene, 2-dihydrocarbylamino-1,2-azaboratabenzene, 1-hydrocarbyloxyboratabenzene, 4-hydrocarbyloxy-1,4-phosphaboratabenzene, 2-hydrocarbyloxy-1,2-azaboratabenzene, 1-hydrocarbylboratabenzene, 4-hydrocarbyl-1,4-phosphaboratabenzene, and 2-hydrocarbyl-1,2-azaboratabenzene, where hydrocarbyl is a “hydrocarbyl radical” as previously defined.

Non-limiting examples of heteropentalenyls include:

Further non-limiting examples of heteropentalenyls include cyclopenta[b]selenophenyl, cyclopenta[c]selenophenyl, cyclopenta[b]tellurophenyl, cyclopenta[c]tellurophenyl, 1-hydrocarbylcyclopenta[b]arsolyl, 2-hydrocarbylcyclopenta[c]arsolyl, 1-hydrocarbylcyclopenta[b]stibolyl, 2-hydrocarbylcyclopenta[c]stibolyl, 1-hydrocarbylcyclopenta[b]pyrrolyl, 2-hydrocarbylcyclopenta[c]pyrrolyl, 1-hydrocarbylcyclopenta[b]phospholyl, and 2-hydrocarbylcyclopenta[c]phospholyl, where hydrocarbyl is a “hydrocarbyl radical” as previously defined.

Non-limiting examples of heterocylopentapentalenyls include the following, where Z and Q independently represent the heteroatoms O, S, Se, or Te, or heteroatom groups, NR**, PR**, AsR**, or SbR** where R** is hydrogen, or a hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, or germylcarbyl substituent.

Non-limiting examples of heteroindenyls include:

Further non-limiting examples of heteroindenyls include cyclopenta[b]arsinyl, cyclopenta[c]arsinyl, cyclopenta[b]stibinyl, cyclopenta[c]stibinyl, 3-dihydrocarbylamino-1,3-benzothiaborollide, 2-dihydrocarbylamino-1,2-benzothiaborollide, 3-hydrocarbyloxy-1,3-benzothiaborollide, 2-hydrocarbyloxy-1,2-benzothiaborollide, 3-hydrocarbyl-1,3-benzothiaborollide, and 2-hydrocarbyl-1,2-benzothiaborollide, where hydrocarbyl is a “hydrocarbyl radical” as previously defined.

Non-limiting examples of heterofluorenyls include:

Non-limiting examples of heterocyclopentanaphthyls include:

Further non-limiting examples of heterocyclopentanaphthyls include cyclopenta[g]phosphinolyl, cyclopenta[g]isophosphinolyl, cyclopenta[g]arsinolyl, and cyclopenta[g]isoarsinolyl.

Non-limiting examples of heterocyclopentaindenyls include:

Further non-limiting examples of heterocyclopentaindenyls include 1-hydrocarbylcyclopenta[f]phosphindolyl, 2-hydrocarbylcyclopenta[f]isophosphindolyl, 1-hydrocarbylcyclopenta[f]arsindolyl, 2-hydrocarbylcyclopenta[f]isoarsindolyl, indeno[5,6-b]selenophenyl, indeno[5,6-b]tellurophenyl, indeno[5,6-c]selenophenyl, indeno[5,6-c]tellurophenyl, 2-hydrocarbylcyclopenta[f]isoindolyl, and 1-hydrocarbylcyclopenta[f]indolyl, where hydrocarbyl is a “hydrocarbyl radical” as previously defined.

Non-limiting examples of heterobenzocyclopentaindenyls include:

Further non-limiting examples of heterobenzocyclopentaindenyls include 5-hydrocarbylindeno[1,2-b]indolyl and 5-hydrocarbylindeno[2,1-b]indolyl, where hydrocarbyl is a “hydrocarbyl radical” as previously defined.

A “ring heteroatom” is a heteroatom that is within a cyclic ring structure. A “heteroatom substituent” is a heteroatom containing group that is directly bonded to a ring structure through the heteroatom. The terms “ring heteroatom” and “heteroatom substituent” are illustrated below where Z is a heteroatom group preferably S, O, Se, Te, N—R^(#), P—R^(#), As—R^(#), Sb—R^(#) or B—R^(#) and each R^(#) is independently a hydrocarbyl, substituted hydrocarbyl, halocarbyl or substituted halocarbyl radical as defined above, and two R^(#) may join together to form a substituted or unsubstituted saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure. If R^(#) is bonded to boron, R^(#) can additionally be a Group 15 or Group 16 group where the heteroatom is directly bonded to boron and R^(#) is then preferably an O—R^(##) group or an N—R^(##) ₂ group, where each R^(##) is independently a hydrocarbyl, substituted hydrocarbyl, halocarbyl or substituted halocarbyl radical as defined above and two R^(##) may join together to form a substituted or unsubstituted saturated, partially unsaturated or aromatic cyclic or polycyclic ring structure.

A “ring carbon atom” is a carbon atom that is part of a cyclic ring structure. By this definition, an indenyl fragment has nine ring carbon atoms.

A “bondable ring position” is a ring position that is capable of bearing a substituent or bridging substituent. For example, cyclopenta[b]thienyl has five bondable ring positions (at the carbon atoms) and one non-bondable ring position (the sulfur atom); cyclopenta[b]pyrrolyl has six bondable ring positions (at the carbon atoms and at the nitrogen atom).

As used herein, the term “monocyclic ligand” is intended to mean any substituted or unsubstituted C₅ to C₁₀₀ monoanionic aromatic five-membered or six-membered single ring structure composed of ring carbon atoms, either alone or in combination with one or more ring heteroatoms. In contrast, the term “monocyclic arenyl ligand” is used herein to mean a substituted or unsubstituted monoanionic C₅ to C₁₀₀ hydrocarbyl ligand that contains an aromatic five-membered single hydrocarbyl ring structure (also referred to as a cyclopentadienyl ring).

As used herein, the term “polycyclic ligand” is intended to mean any substituted or unsubstituted C₅ to C₁₀₃ monoanionic partially unsaturated or aromatic multiple fused ring structure containing at least one aromatic five-membered ring structure, said ligand composed of ring carbon atoms, either alone or in combination with one or more ring heteroatoms. In contrast, the term “polycyclic arenyl ligand” is used herein to mean a substituted or unsubstituted monoanionic C₈ to C₁₀₃ hydrocarbyl ligand that contains an aromatic five-membered hydrocarbyl ring (also referred to as a cyclopentadienyl ring) that is fused to one or two partially unsaturated, or aromatic hydrocarbyl ring structures which may be fused to additional saturated, partially unsaturated, or aromatic hydrocarbyl rings.

Monocyclic ligands include substituted or unsubstituted heterocyclopentadienyls, heterophenyls and cyclopentadienyls. Monocyclic arenyl ligands include substituted or unsubstituted cyclopentadienyls. Polycyclic ligands include substituted or unsubstituted, partially unsaturated or aromatic heteroindenyls, heteropentalenyls, heterocyclopentapentalenyls, heterofluorenyls, heterocyclopentanaphthyls, heterocyclopentaindenyls, heterobenzocyclopentaindenyls, indenyls, pentalenyls, fluorenyls, cyclopentanaphthyls, and cyclopentapentalenyls. Polycyclic arenyl ligands include substituted or unsubstituted, partially unsaturated or aromatic indenyls, pentalenyls, cyclopentapentalenyls, fluorenyls, and cyclopentanaphthyls.

Non-limiting examples of polycyclic arenyl ligands, named as monoanionic ligands, include indenyl, 4,5-dihydroindenyl, 4,7-dihydroindenyl, 4,5,6,7-tetrahydroindenyl, fluorenyl, 1,2-dihydrotetrahydrofluorenyl, 1,4-dihydrotetrahydrofluorenyl, 3,4-dihydrotetrahydrofluorenyl, 1,2,3,4-tetrahydrofluorenyl, 1,2,5,6-tetrahydrofluorenyl, 1,2,7,8-tetrahydrofluorenyl, 3,4,5,6-tetrahydrofluorenyl, 1,4,5,8-tetrahydrofluorenyl, 1,2,3,4,5,6,7,8-octahydrofluorenyl, cyclopenta[b]naphthyl, 4,4a-dihydrocyclopenta[b]naphthyl, 5,6-dihydrocyclopenta[b]naphthyl, 5,8-dihydrocyclopenta[b]naphthyl, 4,9-dihydrocyclopenta[b]naphthyl, 4,4a,5,6-tetrahydrocyclopenta[b]naphthyl, 4,5,8,9-tetrahydrocyclopenta[b]naphthyl, 4,4a,7,8-tetrahydrocyclopenta[b]naphthyl, 4,4a,8a,9-tetrahydrocyclopenta[b]naphthyl, 5,6,7,8-tetrahydrocyclopenta[b]naphthyl, 4,4a,5,8-tetrahydrocyclopenta[b]naphthyl, 4,5,6,9-tetrahydrocyclopenta[b]naphthyl, 4,6,7,8-tetrahydrocyclopenta[b]naphthyl, 4,6,7,9-tetrahydrocyclopenta[b]naphthyl, 4,4a,5,9-tetrahydrocyclopenta[b]naphthyl, 4,4a,5,6,7,8-hexahydrocyclopenta[b]naphthyl, 4,4a,5,6,8a,9-hexahydrocyclopenta[b]naphthyl, 4,4a,5,8,8a,9-hexahydrocyclopenta[b]naphthyl, 4,5,6,7,8,9-hexahydrocyclopenta[b]naphthyl, 4,4a,5,6,7,9-hexahydrocyclopenta[b]naphthyl, 4,4a,5,6,7,8,8a,9-octahydrocyclopenta[b]naphthyl, cyclopenta[a]naphthyl, 4,5-dihydrocyclopenta[a]naphthyl, 6,7-dihydrocyclopenta[a]naphthyl, 8,9-dihydrocyclopenta[a]naphthyl, 5a,9a-dihydrocyclopenta[a]naphthyl, 6,9-dihydrocyclopenta[a]naphthyl, 7,9a-dihydrocyclopenta[a]naphthyl, 4,9a-dihydrocyclopenta[a]naphthyl, 5a,8-dihydrocyclopenta[a]naphthyl, 4,5,5a,9a-tetrahydrocyclopenta[a]naphthyl, 4,5,6,7-tetrahydrocyclopenta[a]naphthyl, 4,5,8,9-tetrahydrocyclopenta[a]naphthyl, 5a,6,7,9a-tetrahydrocyclopenta[a]naphthyl, 6,7,8,9-tetrahydrocyclopenta[a]naphthyl, 5a,8,9,9a-tetrahydrocyclopenta[a]naphthyl, 4,5,7,9a-tetrahydrocyclopenta[a]naphthyl, 5a,6,7,9a-tetrahydrocyclopenta[a]naphthyl, 7,8,9,9a-tetrahydrocyclopenta[a]naphthyl, 4,6,7,9a-tetrahydrocyclopenta[a]naphthyl, 4,8,9,9a-tetrahydrocyclopenta[a]naphthyl, 4,5,6,9-tetrahydrocyclopenta[a]naphthyl, 4,5,5a,8-tetrahydrocyclopenta[a]naphthyl, 5a,6,7,8-tetrahydrocyclopenta[a]naphthyl, a,6,9,9a-tetrahydrocyclopenta[a]naphthyl, 5a,6,7,8,9,9a-hexahydrocyclopenta[a]naphthyl, 4,6,7,8,9,9a-hexahydrocyclopenta[a]naphthyl, 4,5,7,8,9,9a-hexahydrocyclopenta[a]naphthyl, 4,5,5a,8,9,9a-hexahydrocyclopenta[a]naphthyl, 4,5,5a,6,9,9a-hexahydrocyclopenta[a]naphthyl, 4,5,5a,6,7,9a-hexahydrocyclopenta[a]naphthyl, 4,5,5a,6,7,8-hexahydrocyclopenta[a]naphthyl, 4,5,6,7,8,9-hexahydrocyclopenta[a]naphthyl, 4,5,5a,6,7,8,9,9a-hexahydrocyclopenta[a]naphthyl, 4,5,5a,6,7,8,9,9a-octahydrocyclopenta[a]naphthyl, 5,6-trimethyleneindenyl, 4,5-trimethyleneindenyl, 5,6-pentamethyleneindenyl, 4,5-pentamethyleneindenyl, 5,6-hexamethyleneindenyl, 4,5-hexamethyleneindenyl, 5,6-heptamethyleneindenyl, 4,5-heptamethyleneindenyl, 5,6-octamethyleneindenyl, 4,5-octamethyleneindenyl, 5,6-nonamethyleneindenyl, 4,5-nonamethyleneindenyl, 5,6-decamethyleneindenyl, 4,5-decamethyleneindenyl, 5,6-undecamethyleneindenyl, 4,5-undecamethyleneindenyl, 5,6-dodecamethyleneindenyl, 4,5-dodecamethyleneindenyl, 5,6-tridecamethyleneindenyl, 4,5-tridecamethyleneindenyl, 5,6-tetradecamethyleneindenyl, 4,5-tetradecamethyleneindenyl, 5,6-pentadecamethyleneindenyl, 4,5-pentadecamethyleneindenyl, 5,6-hexadecamethyleneindenyl, 4,5-hexadecamethyleneindenyl, 5,6-heptadecamethyleneindenyl, 4,5-heptadecamethyleneindenyl, 5,6-octadecamethyleneindenyl, 4,5-octadecamethyleneindenyl, 5,6-nonadecamethyleneindenyl, 4,5-nonadecamethyleneindenyl, 5,6-eicosamethyleneindenyl, 4,5-eicosamethyleneindenyl, (6Z,8Z,10Z)-cycloocta[e]indenyl, (5Z,7Z,9Z)-cycloocta[f]indenyl, (5E,7Z,9E,11Z,13E)-cyclododeca[f]indenyl, (6E,8Z,10E,12Z,14E)-cyclododeca[e]indenyl, benz[a]fluorenyl, benz[b]fluorenyl, benz[c]fluorenyl, naphth[2,3-a]fluorenyl, naphth[2,3-b]fluorenyl, naphth[2,3-c]fluorenyl, naphth[1,2-a]fluorenyl, naphth[1,2-b]fluorenyl, naphth[1,2-c]fluorenyl, 2,3-tetramethylenefluorenyl, 1,2-tetramethylenefluorenyl, 3,4-tetramethylenefluorenyl, 2,3-trimethylenefluorenyl, 1,2-trimethylenefluorenyl, 3,4-trimethylenefluorenyl, 2,3-pentamethylenefluorenyl, 1,2-pentamethylenefluorenyl, 3,4-pentamethylenefluorenyl, 2,3-hexamethylenefluorenyl, 1,2-hexamethylenefluorenyl, 3,4-hexamethylenefluorenyl, 2,3-heptamethylenefluorenyl, 1,2-heptamethylenefluorenyl, 3,4-heptamethylenefluorenyl, 2,3-octamethylenefluorenyl, 1,2-octamethylenefluorenyl, 3,4-octamethylenefluorenyl, 2,3-nonamethylenefluorenyl, 1,2-nonamethylenefluorenyl, 3,4-nonamethylenefluorenyl, 2,3-decamethylenefluorenyl, 1,2-decamethylenefluorenyl, 3,4-decamethylenefluorenyl, 2,3-undecamethylenefluorenyl, 1,2-undecamethylenefluorenyl, 3,4-undecamethylenefluorenyl, 2,3-dodecamethylenefluorenyl, 1,2-dodecamethylenefluorenyl, 3,4-dodecamethylenefluorenyl, 2,3-tetramethylene-6,7-tetramethylenefluorenyl, 1,2-tetramethylene-7,8-tetramethylenefluorenyl, 3,4-tetramethylene-5,6-tetramethylenefluorenyl, bis-benz[2,3;6,7]fluorenyl, bis-benz[2,3;5,6]fluorenyl, bis-benz[1,2;7,8]fluorenyl, bis-benz[1,2;5,6]fluorenyl, bis-benz[1,2;6,7]fluorenyl, bis-benz[1,2;7,8]fluorenyl, and bis-benz[3,4;5,6]fluorenyl,

Partially hydrogenated polycyclic arene ligands retain the numbering scheme of the parent polycyclic arene ligand, namely the numbering schemes defined for indenyl, fluorenyl, cyclopenta[b]naphthyl, cyclopenta[a]naphthyl ligands.

In the context of this document, “homopolymerization” would produce a polymer made from one monomer. For example, homopolymerization of propylene would produce homopolypropylene. Homopolymerization of ethylene would produce homopolyethylene. Likewise, “copolymerization” would produce polymers with more than one monomer type. For example, ethylene copolymers include polymers of ethylene with α-olefins, cyclic olefins and diolefins, vinylaromatic olefins, α-olefinic diolefins, substituted α-olefins, and/or acetylenically unsaturated monomers.

Non-limiting examples of α-olefins include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, 1-octadecene, 1-nonadecene, 1-eicosene, 1-heneicosene, 1-docosene, 1-tricosene, 1-tetracosene, 1-pentacosene, 1-hexacosene, 1-heptacosene, 1-octacosene, 1-nonacosene, 1-triacontene, 4-methyl-1-pentene, 3-methyl-1-pentene, 5-methyl-1-nonene, 3,5,5-trimethyl-1-hexene, vinylcyclohexane, and vinylnorbornane.

Non-limiting examples of cyclic olefins and diolefins include cyclobutene, cyclopentene, cyclohexene, cycloheptene, cyclooctene, cyclononene, cyclodecene, norbornene, 4-methylnorbornene, 2-methylcyclopentene, 4-methylcyclopentene, vinylcyclohexane, norbornadiene, dicyclopentadiene, 5-ethylidene-2-norbornene, vinylcyclohexene, 5-vinyl-2-norbornene, 1,3-divinylcyclopentane, 1,2-divinylcyclohexane, 1,3-divinylcyclohexane, 1,4-divinylcyclohexane, 1,5-divinylcyclooctane, 1-allyl-4-vinylcyclohexane, 1,4-diallylcyclohexane, 1-allyl-5-vinylcyclooctane, and 1,5-diallylcyclooctane.

Non-limiting examples of vinylaromatic olefins include styrene, para-methylstyrene, para-t-butylstyrene, vinylnaphthylene, vinyltoluene, and divinylbenzene.

Non-limiting examples of α-olefinic dienes include 1,4-hexadiene, 1,5-hexadiene, 1,5-heptadiene, 1,6-heptadiene, 6-methyl-1,6-heptadiene, 1,7-octadiene, 7-methyl-1,7-octadiene, 1,9-decadiene, 1,11-dodecene, 1,13-tetradecene and 9-methyl-1,9-decadiene.

Substituted α-olefins (also called functional group containing α-olefins) include those containing at least one non-carbon Group 13 to 17 atom bound to a carbon atom of the substituted α-olefin where such substitution if silicon may be adjacent to the double bond or terminal to the double bond, or anywhere in between, and where inclusion of non-carbon and non-silicon atoms such as for example B, O, S, Se, Te, N, P, Ge, Sn, Pb, As, F, Cl, Br, or I, are contemplated, where such non-carbon or non-silicon moieties are sufficiently far removed from the double bond so as not to interfere with the coordination polymerization reaction with the catalyst and so to retain the generally hydrocarbyl characteristic. By sufficiently far removed from the double bond we intend that the number of carbon atoms, or the number of carbon and silicon atoms, separating the double bond and the non-carbon or non-silicon moiety is preferably 6 or greater, e.g. 7, or 8, or 9, or 10, or 11, or 12, or 13, or 14 or more. The number of such carbon atoms, or carbon and silicon atoms, is counted from immediately adjacent to the double bond to immediately adjacent to the non-carbon or non-silicon moiety. Examples include 8,8,8-trifluoro-1-octene, 8-methoxyoct-1-ene, 8-methylsulfanyloct-1-ene, 8-dimethylaminooct-1-ene, or combinations thereof. The use of functional group-containing α-olefins where the functional group is closer to the double bond is also within the scope of embodiments of the invention when such olefins may be incorporated in the same manner as are their α-olefin analogs. See, “Metallocene Catalysts and Borane Reagents in The Block/Graft Reactions of Polyolefins”, T. C. Chung, et al, Polym. Mater. Sci. Eng., v. 73, p. 463 (1995), and the masked α-olefin monomers of U.S. Pat. No. 5,153,282. Such monomers permit the preparation of both functional-group containing copolymers capable of subsequent derivatization, and of functional macromers which may be used as graft and block type polymeric segments. Copolymerization can also incorporate α-olefinic macromonomers of up to 2000 mer units.

For purposes of this disclosure, the term oligomer refers to compositions having 2-75 mer units and the term polymer refers to compositions having 76 or more mer units. A mer is defined as a unit of an oligomer or polymer that originally corresponded to the monomer(s) used in the oligomerization or polymerization reaction. For example, the mer of polyethylene would be ethylene.

The term “catalyst system” is defined to mean a catalyst precursor/activator pair. When “catalyst system” is used to describe such a pair before activation, it means the unactivated catalyst (precatalyst) together with an activator and, optionally, a co-activator. When it is used to describe such a pair after activation, it means the activated catalyst and the activator or other charge-balancing moiety.

The transition metal compound may be neutral as in a precatalyst, or a charged species with a counter ion as in an activated catalyst system.

Catalyst precursor is also often referred to as precatalyst, catalyst, catalyst compound, catalyst precursor, transition metal compound or transition metal complex. These words are used interchangeably. Activator and cocatalyst are also used interchangeably. A scavenger is a compound that is typically added to facilitate oligomerization or polymerization by scavenging impurities. Some scavengers may also act as activators and may be referred to as co-activators. A co-activator, that is not a scavenger, may also be used in conjunction with an activator in order to form an active catalyst. In some embodiments a co-activator can be pre-mixed with the transition metal compound to form an alkylated transition metal compound, also referred to as an alkylated invention compound.

Noncoordinating anion (NCA) is defined to mean an anion either that does not coordinate to the catalyst metal cation or that does coordinate to the metal cation, but only weakly. An NCA coordinates weakly enough that a neutral Lewis base, such as an olefinically or acetylenically unsaturated monomer can displace it from the catalyst center. Any metal or metalloid that can form a compatible, weakly coordinating complex may be used or contained in the noncoordinating anion. Suitable metals include, but are not limited to, aluminum, gold, and platinum. Suitable metalloids include, but are not limited to, boron, aluminum, phosphorus, and silicon.

A stoichiometric activator can be either neutral or ionic. The terms ionic activator, and stoichiometric ionic activator can be used interchangeably. Likewise, the terms neutral stoichiometric activator, and Lewis acid activator can be used interchangeably.

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present invention provides a series of halogen substituted metallocene compounds comprising one or more monocyclic or polycyclic ligands that are pi-bonded to the metal atom and include at least one halogen substituent directly bonded to an sp² carbon atom at a bondable ring position of the ligand, wherein the or at least one ligand has one or more ring heteroatoms in its cyclic structure. When combined with a suitable activator, these compounds show activity in the polymerization of olefins, such as ethylene and propylene.

In a first embodiment, the invention provides a metallocene compound represented by the formula (1):

AMX_(n-1)

wherein: M is a transition metal atom having a coordination number of n selected from Group 3, 4, 5 or 6 of the Periodic Table of Elements, or a lanthanide metal atom, or actinide metal atom, preferably a Group 4 transition metal atom selected from titanium, zirconium or hafnium; A is a substituted monocyclic or polycyclic ligand that is pi-bonded to M and is substituted with at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position of the ligand, wherein said ligand also includes one or more ring heteroatoms selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; and the or each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand.

Preferably, the or each ring heteroatom is selected from boron, nitrogen, oxygen, phosphorus, and sulfur.

Conveniently, A is a substituted heterocyclopentadienyl ligand, a substituted heteroindenyl ligand, a substituted heterofluorenyl ligand, or a substituted heterocyclopentanaphthyl ligand.

Preferred examples of the ligand A are substituted arsacyclopentadienyl ligands, substituted azaboratabenzene ligands, substituted azaborindenyl ligands, substituted azaborollide ligands, substituted azacyclopentadienyl ligands, substituted benzothiaborollide ligands, substituted boratabenzene ligands, substituted boracyclopentadienyl ligands, substituted cyclopentathienyl ligands, substituted cyclopentabenzothienyl ligands, substituted cyclopentafuryl ligands, substituted cyclopentapyrrolyl ligands, substituted cyclopentapyridyl ligands, substituted cyclopentaphospholyl ligands, substituted cyclopentaphosphinyl ligands, substituted cyclopentaindolyl ligands, substituted cyclopentaquinolyl ligands, substituted indenodioxolyl ligands, substituted indenothienyl ligands, substituted indenopyridyl ligands, substituted indenophosphinyl ligands, substituted indenofuryl ligands, substituted indenobenzothienyl ligands, substituted indenoindolyl ligands, substituted oxaborollide ligands, substituted phosphaboratabenzene ligands, substituted stibacyclopentadienyl ligands and substituted thiaborollide ligands.

Preferably, the or each halogen substituent is chloro, bromo or iodo, and more preferably is chloro or bromo.

More particularly, the metallocene compound of said first embodiment can have the formula (1)(a):

or the formula (1)(b)

wherein M is a group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom, preferably a Group 4 transition metal atom selected from titanium, zirconium or hafnium; Z is a heteroatom selected from boron and a Group 15 atom, preferably boron, nitrogen, or phosphorus; G is a divalent C₂ to C₄₀ group which forms a monocyclic or polycyclic ring structure fused to the cyclopentadienyl ring and which contains at least one ring heteroatom selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, and a Group 16 atom, preferably boron, nitrogen, oxygen, phosphorus, or sulfur; each R is bonded to any bondable ring position of the ring structure ligand in formulas (1)(a) and (1)(b) including the G group, and is, independently, a hydrogen, hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, or heteroatom substituent wherein the heteroatom is selected from boron, Group 15 atoms, or Group 16 atoms, and optionally, two or more adjacent R may join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent; x represents the number of R substituents bonded to the ring structure ligand; the or each X* is bonded to any sp² carbon atom at a bondable ring position in formulae (1)(a) and (1)(b), including the G group, and is a halogen substituent; z represents the number of X* substituents bonded to the ring structure ligand and is at least one; and each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand.

Preferably, each R is independently selected from hydrogen and a C₁ to C₃₀ hydrocarbyl, particularly methyl.

Where R includes a heteroatom substituent, the heteroatom is preferably selected from boron, nitrogen, oxygen, phosphorus, and sulfur.

Preferably, the or each X* is chloro, bromo or iodo, and more preferably is chloro or bromo.

Examples of metallocene compounds according to said first embodiment include:

-   (8-bromo-6-methylindeno[5,6-d][1,3]dioxolyl)zirconium trichloride, -   (4-bromo-2,3,6-trimethylindeno[5,6-b]thienyl)zirconium trichloride, -   (2-bromo-4,6-dimethylindeno[5,6-b]thienyl)zirconium trichloride, -   (4-bromo-1,2,3,6-tetramethylcyclopenta[f]indolyl)zirconium     trichloride, -   (4-bromo-1-phenyl-2,3,6-triamethylcyclopenta[f]indolyl)zirconium     trichloride, -   (5-bromo-7-methylcyclopenta[g]quinolyl)zirconium trichloride, -   (2-bromo-5,7-dimethylcyclopenta[g]quinolyl)zirconium trichloride, -   (3-bromo-5-methylcyclopenta[b]thienyl)zirconium trichloride, -   (1,3-dichlorocyclopenta[c]thienyl)zirconium trichloride, -   (8-bromo-2-methylcyclopenta[b][1]benzothienyl)zirconium trichloride, -   (8-chloro-2-methylcyclopenta[b][1]benzothienyl)zirconium     trichloride, -   (8-iodo-2-methylcyclopenta[b][1]benzothienyl)zirconium trichloride, -   (3-bromo-5-methylcyclopenta[b]furyl)zirconium trichloride, -   (2-bromo-1,5-dimethylcyclopenta[b]pyrrolyl)zirconium trichloride, -   (2-bromo-5-methyl-1-phenylcyclopenta[b]pyrrolyl)zirconium     trichloride, -   (2-chloro-5-methyl-1-phenylcyclopenta[b]pyrrolyl)zirconium     trichloride, -   (2-iodo-5-methyl-1-phenylcyclopenta[b]pyrrolyl)zirconium     trichloride, -   (2-bromo-1,5-dimethylcyclopenta[b]phospholyl)zirconium trichloride, -   (5-bromo-2,4-dimethylcyclopenta[b]indolyl)zirconium trichloride, -   (4-bromocyclopenta[b]pyridyl)zirconium trichloride, -   (4-bromocyclopenta[b]phosphinyl)zirconium trichloride, -   (2,6-dibromo-1-dimethylamino-1-boratabenzene)zirconium trichloride, -   (4-bromo-3-dimethylamino-1,3-benzothiaborollide)zirconium     trichloride, -   (4-bromo-3a,7a-azaborindenyl)zirconium trichloride, -   (7-bromo-2-dimethylamino-1,2-benzothiaborollide)zirconium     trichloride, -   (3-bromo-2-dimethylamino-1,2-thiaborollide)zirconium trichloride, -   (7-bromoindeno[1,2-c]pyridyl)zirconium trichloride, -   (3-bromoindeno[1,2-c]pyridyl)zirconium trichloride, -   (7-bromoindeno[1,2-c]phosphinyl)zirconium trichloride, -   (2-bromoindeno[1,2-b]thienyl)zirconium trichloride, -   (6-bromoindeno[2,1-b]thienyl)zirconium trichloride, -   (6-bromoindeno[1,2-c]thienyl)zirconium trichloride, -   (6-bromoindeno[1,2-b]thienyl)zirconium trichloride, -   (6-bromo-2,3-dimethylindeno[1,2-b]furyl)zirconium trichloride, -   (2-bromoindeno[1,2-b][1]benzothienyl)zirconium trichloride, -   (8-bromoindeno[1,2-b][1]benzothienyl)zirconium trichloride, -   (8-bromoindeno[2,1-b][1]benzothienyl)zirconium trichloride, -   (3-bromo-6H-indeno[2,1-b][1]benzothienyl)zirconium trichloride, -   (2-bromo-5-methylindeno[1,2-b]indolyl)zirconium trichloride, -   (8-bromo-5-methylindeno[1,2-b]indolyl)zirconium trichloride, -   (8-bromo-5-methylindeno[2,1-b]indolyl)zirconium trichloride, -   (3-bromo-5-methylindeno[2,1-b]indolyl)zirconium trichloride, and     the hafnium and titanium analogs of the examples above.

In a second embodiment, the invention provides a metallocene compound represented by the formula (2):

wherein M is a Group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom, preferably a Group 4 transition metal atom selected from titanium, zirconium or hafnium; each A is, independently, a substituted or unsubstituted monocyclic or polycyclic ligand pi-bonded to M, wherein at least one A includes at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position of the ligand, and wherein each A further includes one or more ring heteroatoms, wherein the or each heteroatom is selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; Y is an optional bridging group that is bonded to each A, and is present when y is one and absent when y is zero; y is zero or one; and each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand; provided that each A is not a substituted or unsubstituted indeno[1,2-b]indolyl ligand.

Conveniently, the cyclic structure of each A contains an aromatic five-membered ring pi-bonded to M. Preferably, each A is independently selected from a substituted heterocyclopentadienyl ligand, a substituted heteroindenyl ligand, a substituted heterofluorenyl ligand, or a substituted heterocyclopentanaphthyl ligand.

Preferably, the or each heteroatom in A is selected from boron, nitrogen, oxygen, phosphorus, and sulfur.

Preferred examples of the ligands A are substituted and unsubstituted arsacyclopentadienyl ligands, substituted and unsubstituted azaboratabenzene ligands, substituted and unsubstituted azaborindenyl ligands, substituted and unsubstituted azaborollide ligands, substituted and unsubstituted azacyclopentadienyl ligands, substituted and unsubstituted benzothiaborollide ligands, substituted and unsubstituted boratabenzene ligands, substituted and unsubstituted boracyclopentadienyl ligands, substituted and unsubstituted cyclopentathienyl ligands, substituted and unsubstituted cyclopentabenzothienyl ligands, substituted and unsubstituted cyclopentafuryl ligands, substituted and unsubstituted cyclopentapyrrolyl ligands, substituted and unsubstituted cyclopentapyridyl ligands, substituted and unsubstituted cyclopentaphospholyl ligands, substituted and unsubstituted cyclopentaphosphinyl ligands, substituted and unsubstituted cyclopentaindolyl ligands, substituted and unsubstituted cyclopentaquinolyl ligands, substituted and unsubstituted indenodioxolyl ligands, substituted and unsubstituted indenothienyl ligands, substituted and unsubstituted indenopyridyl ligands, substituted and unsubstituted indenophosphinyl ligands, substituted and unsubstituted indenofuryl ligands, substituted and unsubstituted indenobenzothienyl ligands, substituted and unsubstituted indenoindolyl ligands, substituted and unsubstituted oxaborollide ligands, substituted and unsubstituted phosphaboratabenzene ligands, substituted and unsubstituted stibacyclopentadienyl ligands and substituted and unsubstituted thiaborollide ligands.

When present, Y is a bridging group containing boron or a Group 14, 15 or 16 element. Examples of suitable bridging groups include R′₂C, R′₂Si, R′₂Ge, R′₂CCR′₂, R′₂CCR′₂CR′₂, R′₂CCR′₂CR′₂CR′₂, R′C═CR′, R′C═CR′CR′₂, R′₂CCR′═CR′CR′₂, R′C═CR′CR′═CR′, R′C═CR′CR′₂CR′₂, R′₂CSiR′₂, R′₂SiSiR′₂, R′₂CSiR′₂CR′₂, R′₂SiCR′₂SiR′₂, R′C═CR′SiR′₂, R′₂CGeR′₂, R′₂GeGeR′₂, R′₂CGeR′₂CR′₂, R′₂GeCR′₂GeR′₂, R′₂SiGeR′₂, R′C═CR′GeR′₂, R′B, R′₂C—BR′, R′₂C—BR′—CR′₂, R′N, R′P, O, S, Se, AsR′, SbR′, O—O, S—S, R′N—NR′, R′P—PR′, O—S, O—NR′, O—PR′, S—NR′, S—PR′, R′N—PR′, R′₂C—O—CR′₂, R′₂CR′₂C—O—CR′₂CR′₂, R′₂C—O—CR′₂CR′₂, R′₂C—O—CR′═CR′, R′₂C—S—CR′₂, R′₂CR′₂C—S—CR′₂CR′₂, R′₂C—S—CR′₂CR′₂, R′₂C—S—CR′═CR′, R′₂C—Se—CR′₂, R′₂CR′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′═CR′, R′₂C—N═CR′, R′₂C—NR′—CR′₂, R′₂C—NR′—CR′₂CR′₂, R′₂C—NR′—CR′═CR, R′₂CR′₂C—NR′—CR′₂CR′₂, R′₂C—P═CR′, and R′₂C—PR′—CR′₂ where R′ is hydrogen or a C₁-C₂₀ containing hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl or germylcarbyl substituent and optionally two or more adjacent R′ may join to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic, cyclic or polycyclic substituent. Preferred examples for the bridging group Y include CH₂, CH₂CH₂, C(CH₃)₂, O, S, NPh, PPh, NMe, PMe, SiMe₂, SiPh₂, SiMePh, Si(CH₂)₃ and Si(CH₂)₄.

Preferably, the or each halogen substituent is chloro, bromo or iodo, and more preferably is chloro or bromo.

Examples of metallocene compounds according to said second embodiment include:

-   rac-dimethylsilanediyl-bis(8-bromo-6-methylindeno[5,6-d][1,3]dioxol-5-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(4-bromo-2,3,6-trimethylindeno[5,6-b]thien-7-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(2-bromo-4,6-dimethylindeno[5,6-b]thien-7-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(4-bromo-1,2,3,6-tetramethylcyclopenta[f]indol-7-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(4-bromo-1-phenyl-2,3,6-triamethylcyclopenta[f]indol-7-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(5-bromo-7-methylcyclopenta[g]quinol-8-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(2-bromo-5,7-dimethylcyclopenta[g]quinol-8-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)zirconium     dichloride, -   meso-dimethylsilanediyl-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(3-chloro-5-methylcyclopenta[b]thien-6-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(3-bromo-5-methyl-2-phenylcyclopenta[b]thien-6-yl)zirconium     dichloride, -   rac-methylidene-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)zirconium     dichloride, -   rac-isopropylidene-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)zirconium     dichloride, -   rac-1,2-ethylidene-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)zirconium     dichloride, -   rac-methyl(4-bromophenyl)silanediyl-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)zirconium     dibromide, -   rac-dimethylsilanediyl-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)zirconium     diiodide, -   rac-dimethylsilanediyl-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)zirconium     difluoride, -   rac-dimethylsilanediyl-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)zirconium     dihydride, -   rac-dimethylsilanediyl-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)dimethylzirconium, -   rac-dimethylsilanediyl-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)diphenylzirconium, -   rac-dimethylsilanediyl-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)dibenzylzirconium, -   rac-dimethylsilanediyl-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)-bis(dimethylamino)zirconium, -   rac-dimethylsilanediyl-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)(N¹,N³-diphenyl-1,3-propanediamino)zirc     onium, -   rac-dimethylsilanediyl-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)dimethoxyzirconium, -   rac-dimethylsilanediyl-bis(3-bromo-5-methylcyclopenta[b]thien-6-yl)(3,3′,5,5′-tetra-tert-butyl-[1,1′-biphenyl]-2,2′-dioxo)zirconium, -   rac-dimethylsilanediyl-bis(1,3-dichlorocyclopenta[c]thien-4-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(8-bromo-2-methylcyclopenta[b][1]benzothien-3-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(8-chloro-2-methylcyclopenta[b][1]benzothien-3-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(8-iodo-2-methylcyclopenta[b][1]benzothien-3-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(3-bromo-5-methylcyclopenta[b]fur-6-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(2-bromo-1,5-dimethylcyclopenta[b]pyrrol-4-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(2-bromo-5-methyl-1-phenylcyclopenta[b]pyrrol-4-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(2-chloro-5-methyl-1-phenylcyclopenta[b]pyrrol-4-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(2-iodo-5-methyl-1-phenylcyclopenta[b]pyrrol-4-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(2-bromo-1,5-dimethylcyclopenta[b]phosphol-4-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(5-bromo-2,4-dimethylcyclopenta[b]indol-1-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(4-bromocyclopenta[b]pyrid-7-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(4-bromocyclopenta[b]phosphin-7-yl)zirconium     dichloride, -   rac-4,4′-dimethylsilanediyl-bis(2,6-dibromo-1-dimethylamino-1-boratabenzene)zirconium     dichloride, -   rac-2,2′-dimethylsilanediyl-bis(4-bromo-3-dimethylamino-1,3-benzothiaborollide-2-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(4-bromo-3a,7a-azaborinden-1-yl)zirconium     dichloride, -   rac-3,3′-dimethylsilanediyl-bis(7-bromo-2-dimethylamino-1,2-benzothiaborollide)zirconium     dichloride, -   rac-5,5′-dimethylsilanediyl-bis(3-bromo-2-dimethylamino-1,2-thiaborollide)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(7-bromoindeno[1,2-c]pyrid-5-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(3-bromoindeno[1,2-c]pyrid-5-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(7-bromoindeno[1,2-c]phosphin-5-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(2-bromoindeno[1,2-b]thien-4-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(6-bromoindeno[2,1-b]thien-8-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(6-bromoindeno[1,2-c]thien-8-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(6-bromoindeno[1,2-b]thien-4-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(6-bromo-2,3-dimethylindeno[1,2-b]fur-4-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(2-bromoindeno[1,2-b][1]benzothien-10-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(8-bromoindeno[1,2-b][1]benzothien-10-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(8-bromoindeno[2,1-b][1]benzothien-6-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(3-bromo-indeno[2,1-b][1]benzothien-6-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(2-bromo-5-methylindeno[1,2-b]indol-10-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(8-bromo-5-methylindeno[1,2-b]indol-10-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(8-bromo-5-methylindeno[2,1-b]indol-6-yl)zirconium     dichloride, -   rac-dimethylsilanediyl-bis(3-bromo-5-methylindeno[2,1-b]indol-6-yl)zirconium     dichloride, -   3,3′-sulfandiyl-bis(2-bromo-5-methylcyclopenta[b]thienyl)zirconium     dichloride, -   3,3′-sulfandiyl-bis(2-chloro-5-methylcyclopenta[b]thienyl)zirconium     dichloride, -   3,3′-sulfandiyl-bis(2-iodo-5-methylcyclopenta[b]thienyl)zirconium     dichloride, -   3,3′-sulfandiyl-bis(2-bromo-5-methylcyclopenta[b]thienyl)zirconium     dichloride, -   3,3′-sulfandiyl-bis(2-bromo-5-methylcyclopenta[b]thienyl)zirconium     dibromide, -   3,3′-sulfandiyl-bis(2-bromo-5-methylcyclopenta[b]thienyl)zirconium     diiodide, -   3,3′-sulfandiyl-bis(2-bromo-5-methylcyclopenta[b]thienyl)zirconium     difluoride, -   3,3′-sulfandiyl-bis(2-bromo-5-methylcyclopenta[b]thienyl)zirconium     dihydride, -   3,3′-sulfandiyl-bis(2-bromo-5-methylcyclopenta[b]thienyl)dimethylzirconium, -   3,3′-sulfandiyl-bis(2-bromo-5-methylcyclopenta[b]thienyl)diphenylzirconium, -   3,3′-sulfandiyl-bis(2-bromo-5-methylcyclopenta[b]thienyl)dibenzylzirconium, -   3,3′-sulfandiyl-bis(2-bromo-5-methylcyclopenta[b]thienyl)-bis(dimethylamino)zirconium, -   3,3′-sulfandiyl-bis(2-bromo-5-methylcyclopenta[b]thienyl)dimethoxyzirconium, -   1,1′-sulfandiyl-bis(3-chlorocyclopenta[c]thienyl)zirconium     dichloride, -   4,4′-sulfandiyl-bis(7-bromoindeno[1,2-c]pyridyl)zirconium     dichloride, -   4,4′-sulfandiyl-bis(3-bromoindeno[1,2-c]pyridyl)zirconium     dichloride, -   6,6′-sulfandiyl-bis(7-bromoindeno[1,2-c]pyridyl)zirconium     dichloride, -   6,6′-sulfandiyl-bis(3-bromoindeno[1,2-c]pyridyl)zirconium     dichloride, -   9,9′-sulfandiyl-bis(7-bromoindeno[1,2-c]pyridyl)zirconium     dichloride, -   9,9′-sulfandiyl-bis(3-bromoindeno[1,2-c]pyridyl)zirconium     dichloride, -   4,6′-sulfandiyl-bis(7-bromoindeno[1,2-c]pyridyl)zirconium     dichloride, -   4,6′-sulfandiyl-bis(3-bromoindeno[1,2-c]pyridyl)zirconium     dichloride, -   4,9′-sulfandiyl-bis(7-bromoindeno[1,2-c]pyridyl)zirconium     dichloride, -   4,9′-sulfandiyl-bis(3-bromoindeno[1,2-c]pyridyl)zirconium     dichloride, -   6,9′-sulfandiyl-bis(7-bromoindeno[1,2-c]pyridyl)zirconium     dichloride, -   6,9′-sulfandiyl-bis(3-bromoindeno[1,2-c]pyridyl)zirconium     dichloride, -   4,4′-sulfandiyl-bis(7-bromoindeno[1,2-c]phosphinyl)zirconium     dichloride, -   3,3′-sulfandiyl-bis(2-bromoindeno[1,2-b]thienyl)zirconium     dichloride, -   3,3′-sulfandiyl-bis(6-bromoindeno[1,2-b]thienyl)zirconium     dichloride, -   5,5′-sulfandiyl-bis(2-bromoindeno[1,2-b]thienyl)zirconium     dichloride, -   5,5′-sulfandiyl-bis(6-bromoindeno[1,2-b]thienyl)zirconium     dichloride, -   8,8′-sulfandiyl-bis(2-bromoindeno[1,2-b]thienyl)zirconium     dichloride, -   8,8′-sulfandiyl-bis(6-bromoindeno[1,2-b]thienyl)zirconium     dichloride, -   3,5′-sulfandiyl-bis(2-bromoindeno[1,2-b]thienyl)zirconium     dichloride, -   3,5′-sulfandiyl-bis(6-bromoindeno[1,2-b]thienyl)zirconium     dichloride, -   3,8′-sulfandiyl-bis(2-bromoindeno[1,2-b]thienyl)zirconium     dichloride, -   3,8′-sulfandiyl-bis(6-bromoindeno[1,2-b]thienyl)zirconium     dichloride, -   5,8′-sulfandiyl-bis(2-bromoindeno[1,2-b]thienyl)zirconium     dichloride, -   5,8′-sulfandiyl-bis(6-bromoindeno[1,2-b]thienyl)zirconium     dichloride, -   3,3′-sulfandiyl-bis(2-bromoindeno[2,1-b]thienyl)zirconium     dichloride, -   3,3′-sulfandiyl-bis(6-bromoindeno[2,1-b]thienyl)zirconium     dichloride, -   4,4′-sulfandiyl-bis(2-bromoindeno[2,1-b]thienyl)zirconium     dichloride, -   4,4′-sulfandiyl-bis(6-bromoindeno[2,1-b]thienyl)zirconium     dichloride, -   7,7′-sulfandiyl-bis(2-bromoindeno[2,1-b]thienyl)zirconium     dichloride, -   7,7′-sulfandiyl-bis(6-bromoindeno[2,1-b]thienyl)zirconium     dichloride, -   3,4′-sulfandiyl-bis(2-bromoindeno[2,1-b]thienyl)zirconium     dichloride, -   3,4′-sulfandiyl-bis(6-bromoindeno[2,1-b]thienyl)zirconium     dichloride, -   3,7′-sulfandiyl-bis(2-bromoindeno[2,1-b]thienyl)zirconium     dichloride, -   3,7′-sulfandiyl-bis(6-bromoindeno[2,1-b]thienyl)zirconium     dichloride, -   4,7′-sulfandiyl-bis(2-bromoindeno[2,1-b]thienyl)zirconium     dichloride, -   4,7′-sulfandiyl-bis(6-bromoindeno[2,1-b]thienyl)zirconium     dichloride, -   1,1′-sulfandiyl-bis(3-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   1,1′-sulfandiyl-bis(6-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   3,3′-sulfandiyl-bis(1-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   3,3′-sulfandiyl-bis(6-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   4,4′-sulfandiyl-bis(3-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   4,4′-sulfandiyl-bis(6-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   7,7′-sulfandiyl-bis(3-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   7,7′-sulfandiyl-bis(6-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   1,3′-sulfandiyl-bis(6-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   1,4′-sulfandiyl-bis(3-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   1,4′-sulfandiyl-bis(6-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   1,7′-sulfandiyl-bis(3-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   1,7′-sulfandiyl-bis(6-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   3,4′-sulfandiyl-bis(1-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   3,4′-sulfandiyl-bis(6-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   3,7′-sulfandiyl-bis(1-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   3,7′-sulfandiyl-bis(6-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   4,7′-sulfandiyl-bis(3-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   4,7′-sulfandiyl-bis(6-bromoindeno[1,2-c]thienyl)zirconium     dichloride, -   3,3′-sulfandiyl-bis(2-bromoindeno[1,2-b]furyl)zirconium dichloride, -   3,3′-sulfandiyl-bis(6-bromoindeno[1,2-b]furyl)zirconium dichloride, -   5,5′-sulfandiyl-bis(2-bromoindeno[1,2-b]furyl)zirconium dichloride, -   5,5′-sulfandiyl-bis(6-bromoindeno[1,2-b]furyl)zirconium dichloride, -   8,8′-sulfandiyl-bis(2-bromoindeno[1,2-b]furyl)zirconium dichloride, -   8,8′-sulfandiyl-bis(6-bromoindeno[1,2-b]furyl)zirconium dichloride, -   3,5′-sulfandiyl-bis(2-bromoindeno[1,2-b]furyl)zirconium dichloride, -   3,5′-sulfandiyl-bis(6-bromoindeno[1,2-b]furyl)zirconium dichloride, -   3,8′-sulfandiyl-bis(2-bromoindeno[1,2-b]furyl)zirconium dichloride, -   3,8′-sulfandiyl-bis(6-bromoindeno[1,2-b]furyl)zirconium dichloride, -   5,8′-sulfandiyl-bis(2-bromoindeno[1,2-b]furyl)zirconium dichloride, -   5,8′-sulfandiyl-bis(6-bromoindeno[1,2-b]furyl)zirconium dichloride, -   6,6′-sulfandiyl-bis(2-bromo-5-methylindeno[1,2-b]indolyl)zirconium     dichloride, -   6,6′-sulfandiyl-bis(8-bromo-5-methylindeno[1,2-b]indolyl)zirconium     dichloride, -   9,9′-sulfandiyl-bis(2-bromo-5-methylindeno[1,2-b]indolyl)zirconium     dichloride, -   9,9′-sulfandiyl-bis(8-bromo-5-methylindeno[1,2-b]indolyl)zirconium     dichloride, -   6,9′-sulfandiyl-bis(2-bromo-5-methylindeno[1,2-b]indolyl)zirconium     dichloride, -   6,9′-sulfandiyl-bis(8-bromo-5-methylindeno[1,2-b]indolyl)zirconium     dichloride, -   7,7′-sulfandiyl-bis(8-bromo-5-methylindeno[2,1-b]indolyl)zirconium     dichloride, -   7,7′-sulfandiyl-bis(3-bromo-5-methylindeno[2,1-b]indolyl)zirconium     dichloride, -   10,10′-sulfandiyl-bis(8-bromo-5-methylindeno[2,1-b]indolyl)zirconium     dichloride, -   10,10′-sulfandiyl-bis(3-bromo-5-methylindeno[2,1-b]indolyl)zirconium     dichloride, -   7,10′-sulfandiyl-bis(8-bromo-5-methylindeno[2,1-b]indolyl)zirconium     dichloride, -   7,10′-sulfandiyl-bis(3-bromo-5-methylindeno[2,1-b]indolyl)zirconium     dichloride, -   3,3′-oxadiyl-bis(2-bromo-5-methylcyclopenta[b]thienyl)zirconium     dichloride, -   3,3′-methylazadiyl-bis(2-bromo-5-methylcyclopenta[b]thienyl)zirconium     dichloride, -   3,3′-phenylazadiyl-bis(2-bromo-5-methylcyclopenta[b]thienyl)zirconium     dichloride, and     the hafnium and titanium analogs of the examples above.

In a third embodiment, the invention provides a metallocene compound represented by the formula (3):

wherein M is a Group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom, preferably a Group 4 transition metal atom selected from titanium, zirconium or hafnium; A is a substituted or unsubstituted monocyclic or polycyclic ligand pi-bonded to M, wherein A includes one or more ring heteroatoms selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; E is a substituted or unsubstituted monocyclic or polycyclic arenyl ligand pi-bonded to M at least one of A and E includes at least one halogen substituent directly bonded to an sp² carbon atom at a bondable ring position of the ligand; Y is an optional bridging group that is bonded to E and A, and is present when y is one and absent when y is zero; y is zero or one; and each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand.

In one embodiment, the cyclic structure of A contains an aromatic five-membered ring pi-bonded to M. Preferably, A is a substituted or unsubstituted heterocyclopentadienyl ligand, a substituted or unsubstituted heteroindenyl ligand, a substituted or unsubstituted heterofluorenyl ligand, or a substituted or unsubstituted heterocyclopentanaphthyl ligand. Conveniently, A includes at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position.

Preferred examples of the ligand A are substituted and unsubstituted arsacyclopentadienyl ligands, substituted and unsubstituted azaboratabenzene ligands, substituted and unsubstituted azaborindenyl ligands, substituted and unsubstituted azaborollide ligands, substituted and unsubstituted azacyclopentadienyl ligands, substituted and unsubstituted benzothiaborollide ligands, substituted and unsubstituted boratabenzene ligands, substituted and unsubstituted boracyclopentadienyl ligands, substituted and unsubstituted cyclopentathienyl ligands, substituted and unsubstituted cyclopentabenzothienyl ligands, substituted and unsubstituted cyclopentafuryl ligands, substituted and unsubstituted cyclopentapyrrolyl ligands, substituted and unsubstituted cyclopentapyridyl ligands, substituted and unsubstituted cyclopentaphospholyl ligands, substituted and unsubstituted cyclopentaphosphinyl ligands, substituted and unsubstituted cyclopentaindolyl ligands, substituted and unsubstituted cyclopentaquinolyl ligands, substituted and unsubstituted indenodioxolyl ligands, substituted and unsubstituted indenothienyl ligands, substituted and unsubstituted indenopyridyl ligands, substituted and unsubstituted indenophosphinyl ligands, substituted and unsubstituted indenofuryl ligands, substituted and unsubstituted indenobenzothienyl ligands, substituted and unsubstituted indenoindolyl ligands, substituted and unsubstituted oxaborollide ligands, substituted and unsubstituted phosphaboratabenzene ligands, substituted and unsubstituted stibacyclopentadienyl ligands and substituted and unsubstituted thiaborollide ligands.

Conveniently, the cyclic structure of E contains an aromatic five-member ring pi-bonded to M. Preferably, E is a substituted or unsubstituted cyclopentadienyl ligand, a substituted or unsubstituted indenyl ligand, a substituted or unsubstituted fluorenyl ligand, or a substituted or unsubstituted cyclopentanaphthyl ligand. Conveniently, E includes at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position.

When present, Y is a bridging group containing boron or a Group 14, 15 or 16 element. Examples of suitable bridging groups include R′₂C, R′₂Si, R′₂Ge, R′₂CCR′₂, R′₂CCR′₂CR′₂, R′₂CCR′₂CR′₂CR′₂, R′C═CR′, R′C═CR′CR′₂, R′₂CCR′═CR′CR′₂, R′C═CR′CR′═CR′, R′C═CR′CR′₂CR′₂, R′₂CSiR′₂, R′₂SiSiR′₂, R′₂CSiR′₂CR′₂, R′₂SiCR′₂SiR′₂, R′C═CR′SiR′₂, R′₂CGeR′₂, R′₂GeGeR′₂, R′₂CGeR′₂CR′₂, R′₂GeCR′₂GeR′₂, R′₂SiGeR′₂, R′C═CR′GeR′₂, R′B, R′₂C—BR′, R′₂C—BR′—CR′₂, R′N, R′P, O, S, Se, AsR′, SbR′, O—O, S—S, R′N—NR′, R′P—PR′, O—S, O—NR′, O—PR′, S—NR′, S—PR′, R′N—PR′, R′₂C—O—CR′₂, R′₂CR′₂C—O—CR′₂CR′₂, R′₂C—O—CR′₂CR′₂, R′₂C—O—CR′═CR′, R′₂C—S—CR′₂, R′₂CR′₂C—S—CR′₂CR′₂, R′₂C—S—CR′₂CR′₂, R′₂C—S—CR′═CR′, R′₂C—Se—CR′₂, R′₂CR′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′═CR′, R′₂C—N═CR′, R′₂C—NR′—CR′₂, R′₂C—NR′—CR′₂CR′₂, R′₂C—NR′—CR′═CR′, R′₂CR′₂C—NR′—CR′₂CR′₂, R′₂C—P═CR′, and R′₂C—PR′—CR′₂ where R′ is hydrogen or a C₁-C₂₀ containing hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl or germylcarbyl substituent and optionally two or more adjacent R′ may join to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic, cyclic or polycyclic substituent. Preferred examples for the bridging group Y include CH₂, CH₂CH₂, C(CH₃)₂, O, S, NPh, PPh, NMe, PMe, SiMe₂, SiPh₂, SiMePh, Si(CH₂)₃ and Si(CH₂)₄.

Preferably, the or each halogen substituent is a chloro, bromo or iodo substituent, or more preferably is a chloro or bromo substituent.

Examples of metallocene compounds according to said third embodiment include:

-   (1-dimethylaminoboratabenzene)(4-bromo-2-methylindenyl)zirconium     dichloride, -   (3-dimethylamino-1,3-azaborollide)(4-bromo-2-methylindenyl)zirconium     dichloride, -   (2-dimethylamino-1,2-oxaborollide)(4-bromo-2-methylindenyl)zirconium     dichloride, -   (2-dimethylamino-1,2-thiaborollide)(4-bromo-2-methylindenyl)zirconium     dichloride, -   (2,6-dimethyl-4-dimethylamino-1,4-phosphaboratabenzene)(4-bromo-2-methylindenyl)zirconium     dichloride, -   (2-dimethylamino-1,2-azaboratobenzene)(4-bromo-2-methylindenyl)zirconium     dichloride, -   (cyclopentadienyl)(8-bromo-6-methylindeno[5,6-d][1,3]dioxolyl)zirconium     dichloride, -   (cyclopentadienyl)(4-bromo-2,3,6-trimethylindeno[5,6-b]thienyl)zirconium     dichloride, -   (cyclopentadienyl)(2-bromo-4,6-dimethylindeno[5,6-b]thienyl)zirconium     dichloride, -   (cyclopentadienyl)(4-bromo-1,2,3,6-tetramethylcyclopenta[f]indolyl)zirconium     dichloride, -   (cyclopentadienyl)(4-bromo-1-phenyl-2,3,6-trimethylcyclopenta[f]indolyl)     zirconium dichloride, -   (cyclopentadienyl)(5-bromo-7-methylcyclopenta[g]quinolyl)zirconium     dichloride, -   (cyclopentadienyl)(2-bromo-5,7-dimethylcyclopenta[g]quinolyl)zirconium     dichloride, -   (5-methylcyclopenta[b]thienyl)(4-bromo-2-methylindenyl)zirconium     dichloride, -   (3-bromo-5-methylcyclopenta[b]thienyl)(4-phenyl-2-methylindenyl)zirconium     dichloride, -   (cyclopentadienyl)(3-bromo-5-methylcyclopenta[b]thienyl)zirconium     dichloride, -   (cyclopentadienyl)(1,3-dichlorocyclopenta[c]thienyl)zirconium     dichloride, -   (cyclopentadienyl)(8-bromo-2-methylcyclopenta[b][1]benzothienyl)zirconium     dichloride, -   (cyclopentadienyl)(8-chloro-2-methylcyclopenta[b][1]benzothienyl)zirconium     dichloride, -   (cyclopentadienyl)(8-iodo-2-methylcyclopenta[b][1]benzothienyl)zirconium     dichloride, -   (cyclopentadienyl)(3-bromo-5-methylcyclopenta[b]furyl)zirconium     dichloride, -   (cyclopentadienyl)(2-bromo-1,5-dimethylcyclopenta[b]pyrrolyl)zirconium     dichloride, -   (cyclopentadienyl)(2-bromo-5-methyl-1-phenylcyclopenta[b]pyrrolyl)zirconium     dichloride, -   (cyclopentadienyl)(2-chloro-5-methyl-1-phenylcyclopenta[b]pyrrolyl)zirconium     dichloride, -   (cyclopentadienyl)(2-iodo-5-methyl-1-phenylcyclopenta[b]pyrrolyl)zirconium     dichloride, -   (cyclopentadienyl)(2-bromo-1,5-dimethylcyclopenta[b]phospholyl)zirconium     dichloride, -   (cyclopentadienyl)(5-bromo-2,4-dimethylcyclopenta[b]indolyl)zirconium     dichloride, -   (cyclopentadienyl)(4-bromocyclopenta[b]pyridyl)zirconium dichloride, -   (cyclopentadienyl)(4-bromocyclopenta[b]phosphinyl)zirconium     dichloride, -   (cyclopentadienyl)(2,6-dibromo-1-dimethylamino-1-boratabenzene)zirconium     dichloride, -   (cyclopentadienyl)(4-bromo-3-dimethylamino-1,3-benzothiaborollide)zirconium     dichloride, -   (cyclopentadienyl)(4-bromo-3a,7a-azaborindenyl)zirconium dichloride, -   (cyclopentadienyl)(7-bromo-2-dimethylamino-1,2-benzothiaborollide)zirconium     dichloride, -   (cyclopentadienyl)(3-bromo-2-dimethylamino-1,2-thiaborollide)zirconium     dichloride, -   (cyclopentadienyl)(7-bromoindeno[1,2-c]pyridyl)zirconium dichloride, -   (cyclopentadienyl)(3-bromoindeno[1,2-c]pyridyl)zirconium dichloride, -   (cyclopentadienyl)(7-bromoindeno[1,2-c]phosphinyl)zirconium     dichloride, -   (cyclopentadienyl)(2-bromoindeno[1,2-b]thienyl)zirconium dichloride, -   (cyclopentadienyl)(6-bromoindeno[2,1-b]thienyl)zirconium dichloride, -   (cyclopentadienyl)(6-bromoindeno[1,2-c]thienyl)zirconium dichloride, -   (cyclopentadienyl)(6-bromoindeno[1,2-b]thienyl)zirconium dichloride, -   (cyclopentadienyl)(6-bromo-2,3-dimethylindeno[1,2-b]furyl)zirconium     dichloride, -   (cyclopentadienyl)(2-bromoindeno[1,2-b][1]benzothienyl)zirconium     dichloride, -   (cyclopentadienyl)(8-bromoindeno[1,2-b][1]benzothienyl)zirconium     dichloride, -   (cyclopentadienyl)(8-bromoindeno[2,1-b][1]benzothienyl)zirconium     dichloride, -   (cyclopentadienyl)(3-bromo-indeno[2,1-b][1]benzothienyl)zirconium     dichloride, -   (cyclopentadienyl)(2-bromo-5-methylindeno[1,2-b]indolyl)zirconium     dichloride, -   (cyclopentadienyl)(8-bromo-5-methylindeno[1,2-b]indolyl)zirconium     dichloride, -   (cyclopentadienyl)(8-bromo-5-methylindeno[2,1-b]indolyl)zirconium     dichloride, -   (cyclopentadienyl)(3-bromo-5-methylindeno[2,1-b]indolyl)zirconium     dichloride, -   dimethylsilanediyl(cyclopentadienyl)(8-bromo-6-methylindeno[5,6-d][1,3]dioxol-5-yl)zirconium     dichloride, -   dimethylsilanediyl(cyclopentadienyl)(4-bromo-2,3,6-trimethylindeno[5,6-b]thien-7-yl)zirconium     dichloride, -   dimethylsilanediyl(cyclopentadienyl)(2-bromo-4,6-dimethylindeno[5,6-b]thien-7-yl)zirconium     dichloride, -   dimethylsilanediyl(cyclopentadienyl)(4-bromo-1,2,3,6-tetramethylcyclopenta[f]indol-7-yl)zirconium     dichloride, -   dimethylsilanediyl(cyclopentadienyl)(4-bromo-1-phenyl-2,3,6-triamethylcyclopenta[t]indol-7-yl)zirconium     dichloride, -   dimethylsilanediyl(cyclopentadienyl)(5-bromo-7-methylcyclopenta[g]quinol-8-yl)zirconium     dichloride, -   dimethylsilanediyl(cyclopentadienyl)(2-bromo-5,7-dimethylcyclopenta[g]quinol-8-yl)zirconium     dichloride, -   rac-dimethylsilanediyl(5-methylcyclopenta[b]thienyl)(4-bromo-2-methylinden-1-yl)zirconium     dichloride, -   rac-dimethylsilanediyl(3-bromo-5-methylcyclopenta[b]thienyl)(4-phenyl-2-methylinden-1-yl)zirconium     dichloride, -   sulfandiyl-(7-bromo-2-methylnden-4-yl)(2-bromo-5-methylcyclopenta[b]thien-3-yl)zirconium     dichloride, -   sulfandiyl-(7-bromo-2-methylnden-4-yl)(5-methylcyclopenta[b]thien-3-yl)zirconium     dichloride, -   sulfandiyl-(2-methylnden-4-yl)(2-bromo-5-methylcyclopenta[b]thien-3-yl)zirconium     dichloride, -   sulfandiyl-(7-bromo-2-methylnden-4-yl)(3-chlorocyclopenta[c]thien-1-yl)zirconium     dichloride, -   sulfandiyl-(7-bromo-2-methylnden-4-yl)(cyclopenta[b][1]benzothien-1-yl)zirconium     dichloride, -   sulfandiyl-(7-bromo-2-methylnden-4-yl)(5-methylcyclopenta[b]fur-3-yl)zirconium     dichloride, -   sulfandiyl-(7-bromo-2-methylnden-4-yl)(1,5-dimethylcyclopenta[b]pyrrol-3-yl)zirconium     dichloride, -   sulfandiyl-(7-bromo-2-methylnden-4-yl)(1,5-dimethylcyclopenta[b]phosphol-3-yl)zirconium     dichloride, -   sulfandiyl-(7-bromo-2-methylnden-4-yl)(5-bromo-4-methylcyclopenta[b]indol-1-yl)zirconium     dichloride, -   sulfandiyl-(7-bromo-2-methylnden-4-yl)(cyclopenta[b]pyrid-4-yl)zirconium     dichloride, -   4,4′-sulfandiyl-(7-bromo-2-methyindenyl)(1-dimethylamino-1-boratabenzene)zirconium     dichloride, -   4,4′-sulfandiyl-(7-bromo-2-methyindenyl)(3-dimethylamino-1,3-benzothiaborollide)zirconium     dichloride, -   4,3′-sulfandiyl-(7-bromo-2-methyindenyl)(2-dimethylamino-1,2-thiaborollide)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(cyclopentadienyl)     zirconium dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(3-chlorocyclopenta[c]thien-1-yl)(cyclopentadienyl)zirconium     dichloride, -   sulfandiyl-(3-chlorocyclopenta[c]thien-1-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(3-chlorocyclopenta[c]thien-1-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(3-chlorocyclopenta[c]thien-1-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(3-chlorocyclopenta[c]thien-1-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(3-chlorocyclopenta[c]thien-1-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-4-yl)(cyclopentadienyl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-4-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-4-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-4-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-4-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-4-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-6-yl)(cyclopentadienyl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-6-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-6-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-6-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-6-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-6-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-9-yl)(cyclopentadienyl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-9-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-9-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-9-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-9-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]pyrid-9-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]phosphin-4-yl)(cyclopentadienyl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]phosphin-4-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]phosphin-4-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]phosphin-4-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]phosphin-4-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(7-bromoindeno[1,2-c]phosphin-4-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]thien-3-yl)(cyclopentadienyl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]thien-3-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]thien-3-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]thien-3-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]thien-3-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]thien-3-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]thien-5-yl)(cyclopentadienyl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]thien-5-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]thien-5-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]thien-5-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]thien-5-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]thien-5-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-3-yl)(cyclopentadienyl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-3-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-3-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-3-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-3-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-3-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-4-yl)(cyclopentadienyl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-4-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-4-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-4-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-4-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-4-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-7-yl)(cyclopentadienyl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-7-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-7-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-7-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-7-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[2,1-b]thien-7-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(cyclopentadienyl)     zirconium dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(1-bromoindeno[1,2-c]thien-3-yl)(cyclopentadienyl)zirconium     dichloride, -   sulfandiyl-(1-bromoindeno[1,2-c]thien-3-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(1-bromoindeno[1,2-c]thien-3-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(1-bromoindeno[1,2-c]thien-3-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(1-bromoindeno[1,2-c]thien-3-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(1-bromoindeno[1,2-c]thien-3-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(3-bromoindeno[1,2-c]thien-4-yl)(cyclopentadienyl)zirconium     dichloride, -   sulfandiyl-(3-bromoindeno[1,2-c]thien-4-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(3-bromoindeno[1,2-c]thien-4-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(3-bromoindeno[1,2-c]thien-4-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(3-bromoindeno[1,2-c]thien-4-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(3-bromoindeno[1,2-c]thien-4-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(3-bromoindeno[1,2-c]thien-7-yl)(cyclopentadienyl)zirconium     dichloride, -   sulfandiyl-(3-bromoindeno[1,2-c]thien-7-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(3-bromoindeno[1,2-c]thien-7-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(3-bromoindeno[1,2-c]thien-7-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(3-bromoindeno[1,2-c]thien-7-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(3-bromoindeno[1,2-c]thien-7-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-3-yl)(cyclopentadienyl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-3-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-3-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-3-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-3-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-3-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-5-yl)(cyclopentadienyl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-5-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-5-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-5-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-5-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-5-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-8-yl)(cyclopentadienyl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-8-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-8-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-8-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-8-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromoindeno[1,2-b]fur-8-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylindeno[1,2-b]indol-6-yl)(cyclopentadienyl)     zirconium dichloride, -   sulfandiyl-(2-bromo-5-methylindeno[1,2-b]indol-6-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylindeno[1,2-b]indol-6-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylindeno[1,2-b]indol-6-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylindeno[1,2-b]indol-6-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylindeno[1,2-b]indol-6-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylindeno[1,2-b]indol-9-yl)(cyclopentadienyl)     zirconium dichloride, -   sulfandiyl-(2-bromo-5-methylindeno[1,2-b]indol-9-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylindeno[1,2-b]indol-9-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylindeno[1,2-b]indol-9-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylindeno[1,2-b]indol-9-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylindeno[1,2-b]indol-9-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(8-bromo-5-methylindeno[2,1-b]indol-7-yl)(cyclopentadienyl)     zirconium dichloride, -   sulfandiyl-(8-bromo-5-methylindeno[2,1-b]indol-7-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(8-bromo-5-methylindeno[2,1-b]indol-7-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(8-bromo-5-methylindeno[2,1-b]indol-7-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(8-bromo-5-methylindeno[2,1-b]indol-7-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(8-bromo-5-methylindeno[2,1-b]indol-7-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(8-bromo-5-methylindeno[2,1-b]indol-10-yl)(cyclopentadienyl)     zirconium dichloride, -   sulfandiyl-(8-bromo-5-methylindeno[2,1-b]indol-10-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(8-bromo-5-methylindeno[2,1-b]indol-10-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(8-bromo-5-methylindeno[2,1-b]indol-10-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(8-bromo-5-methylindeno[2,1-b]indol-10-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(8-bromo-5-methylindeno[2,1-b]indol-10-yl)(fluoren-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(cyclopentadienyl)     zirconium dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(inden-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(inden-4-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(fluoren-9-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(fluoren-1-yl)zirconium     dichloride, -   sulfandiyl-(2-bromo-5-methylcyclopenta[b]thien-3-yl)(fluoren-4-yl)zirconium     dichloride, -   4,4′-sulfandiyl-(2-[2-chlorobenzothien-4-yl]indenyl)(indenyl)zirconium     dichloride, and     the hafnium and titanium analogs of the examples above.

In a fourth embodiment, the invention provides a metallocene compound represented by the formula (4):

wherein M is a Group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom, preferably a Group 4 transition metal atom selected from titanium, zirconium or hafnium; A is a substituted monocyclic or polycyclic ligand that is pi-bonded to M and is substituted with at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position of the ligand, wherein A includes one or more ring heteroatoms selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; Y is an optional bridging group that is bonded to A and T, and is present when y is one and absent when y is zero; y is zero or one; and T is a heteroatom with a coordination number of three from Group 15 or with a coordination number of two from Group 16 of the Periodic Table of Elements; R″ is selected from a C₃-C₁₀₀ substituted or unsubstituted monocyclic or polycyclic ring structure substituent that is partially unsaturated, unsaturated or aromatic; or a C₂-C₁₀₀ substituted or unsubstituted, unsaturated or partially unsaturated, linear or branched alicyclic hydrocarbyl substituent; or a C₁-C₁₀₀ substituted or unsubstituted saturated hydrocarbyl radical; t is the coordination number of the heteroatom T where “t-1-y” indicates the number of R″ substituents bonded to T; and each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand.

Conveniently, t-1-y is equal to 1 and preferably T is a nitrogen atom.

When R″ is a C₃-C₁₀₀ substituted or unsubstituted monocyclic or polycyclic ring structure substituent that is partially unsaturated, unsaturated or aromatic, non-limiting examples of R″ include all isomers of cycloalkenes, and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar group substituted cycloalkanes including: cyclopropenyl, cyclobutenyl, cyclopentenyl, cyclohexenyl, cycloheptenyl, cyclooctenyl, cyclononenyl, cyclodecenyl, cycloundecenyl, cyclododecenyl, cyclotridecenyl, cyclotetradecenyl, cyclopentadecenyl, cyclohexadecenyl, cycloheptadecenyl, cyclooctadecenyl, cyclononadecenyl, cycloeicosenyl, cycloheneicosenyl, cyclodocosenyl, cyclotricosenyl, cyclotetracosenyl, cyclopentacosenyl, cyclohexacosenyl, cycloheptacosenyl, cyclooctacosenyl, cyclononacosenyl, cyclotriacontenyl, cyclobutadienyl, cyclopentadienyl, cyclohexadienyl, cycloheptadienyl, cyclooctadienyl, cyclononadienyl, cyclodecadienyl, cycloundecadienyl, cyclododecadienyl, cyclotridecadienyl, cyclotetradecadienyl, cyclopentadecadienyl, cyclohexadecadienyl, cycloheptadecadienyl, cyclooctadecadienyl, cyclononadecadienyl, cycloeicosadienyl, cycloheneicosadienyl, cyclodocosadienyl, cyclotricosadienyl, cyclotetracosadienyl, cyclopentacosadienyl, cyclohexacosadienyl, cycloheptacosadienyl, cyclooctacosadienyl, cyclononacosadienyl, cyclotriacontadienyl, cyclohexatrienyl, cycloheptatrienyl, cyclooctatrienyl, cyclononatrienyl, cyclodecatrienyl, cycloundecatrienyl, cyclododecatrienyl, cyclotridecatrienyl, cyclotetradecatrienyl, cyclopentadecatrienyl, cyclohexadecatrienyl, cycloheptadecatrienyl, cyclooctadecatrienyl, cyclononadecatrienyl, cycloeicosatrienyl, cycloheneicosatrienyl, cyclodocosatrienyl, cyclotricosatrienyl, cyclotetracosatrienyl, cyclopentacosatrienyl, cyclohexacosatrienyl, cycloheptacosatrienyl, cyclooctacosatrienyl, cyclononacosatrienyl, cyclotriacontatrienyl, cyclooctatetrenyl, cyclononatetrenyl, cyclodecatetrenyl, cycloundecatetrenyl, cyclododecatetrenyl, cyclotridecatetrenyl, cyclotetradecatetrenyl, cyclopentadecatetrenyl, cyclohexadecatetrenyl, cycloheptadecatetrenyl, cyclooctadecatetrenyl, cyclononadecatetrenyl, cycloeicosatetrenyl, cycloheneicosatetrenyl, cyclodocosatetrenyl, cyclotricosatetrenyl, cyclotetracosatetrenyl, cyclopentacosatetrenyl, cyclohexacosatetrenyl, cycloheptacosatetrenyl, cyclooctacosatetrenyl, cyclononacosatetrenyl, cyclotriacontatetrenyl, cyclodecapentaenyl, cycloundecapentaenyl, cyclododecapentaenyl, cyclotridecapentaenyl, cyclotetradecapentaenyl, cyclopentadecapentaenyl, cyclohexadecapentaenyl, cycloheptadecapentaenyl, cyclooctadecapentaenyl, cyclononadecapentaenyl, cycloeicosapentaenyl, cycloheneicosapentaenyl, cyclodocosapentaenyl, cyclotricosapentaenyl, cyclotetracosapentaenyl, cyclopentacosapentaenyl, cyclohexacosapentaenyl, cycloheptacosapentaenyl, cyclooctacosapentaenyl, cyclononacosapentaenyl, cyclotriacontapentaenyl, cyclododecahexaenyl, cyclotridecahexaenyl, cyclotetradecahexaenyl, cyclopentadecahexaenyl, cyclohexadecahexaenyl, cycloheptadecahexaenyl, cyclooctadecahexaenyl, cyclononadecahexaenyl, cycloeicosahexaenyl, cycloheneicosahexaenyl, cyclodocosahexaenyl, cyclotricosahexaenyl, cyclotetracosahexaenyl, cyclopentacosahexaenyl, cyclohexacosahexaenyl, cycloheptacosahexaenyl, cyclooctacosahexaenyl, cyclononacosahexaenyl, cyclotriacontahexaenyl, cyclotetradecaheptaenyl, cyclopentadecaheptaenyl, cyclohexadecaheptaenyl, cycloheptadecaheptaenyl, cyclooctadecaheptaenyl, cyclononadecaheptaenyl, cycloeicosaheptaenyl, cycloheneicosaheptaenyl, cyclodocosaheptaenyl, cyclotricosaheptaenyl, cyclotetracosaheptaenyl, cyclopentacosaheptaenyl, cyclohexacosaheptaenyl, cycloheptacosaheptaenyl, cyclooctacosaheptaenyl, cyclononacosaheptaenyl, cyclotriacontaheptaenyl, cyclohexadecaoctaenyl, cycloheptadecaoctaenyl, cyclooctadecaoctaenyl, cyclononadecaoctaenyl, cycloeicosaoctaenyl, cycloheneicosaoctaenyl, cyclodocosaoctaenyl, cyclotricosaoctaenyl, cyclotetracosaoctaenyl, cyclopentacosaoctaenyl, cyclohexacosaoctaenyl, cycloheptacosaoctaenyl, cyclooctacosaoctaenyl, cyclononacosaoctaenyl, cyclotriacontaoctaenyl, cyclooctadecanonaenyl, cyclononadecanonaenyl, cycloeicosanonaenyl, cycloheneicosanonaenyl, cyclodocosanonaenyl, cyclotricosanonaenyl, cyclotetracosanonaenyl, cyclopentacosanonaenyl, cyclohexacosanonaenyl, cycloheptacosanonaenyl, cyclooctacosanonaenyl, cyclononacosanonaenyl, cyclotriacontanonaenyl, cycloeicosadecaenyl, cycloheneicosadecaenyl, cyclodocosadecaenyl, cyclotricosadecaenyl, cyclotetracosadecaenyl, cyclopentacosadecaenyl, cyclohexacosadecaenyl, cycloheptacosadecaenyl, cyclooctacosadecaenyl, cyclononacosadecaenyl, cyclotriacontadecaenyl, cyclodocosaundecaenyl, cyclotricosaundecaenyl, cyclotetracosaundecaenyl, cyclopentacosaundecaenyl, cyclohexacosaundecaenyl, cycloheptacosaundecaenyl, cyclooctacosaundecaenyl, cyclononacosaundecaenyl, cyclotriacontaundecaenyl, cyclotetracosadodecaenyl, cyclopentacosadodecaenyl, cyclohexacosadodecaenyl, cycloheptacosadodecaenyl, cyclooctacosadodecaenyl, cyclononacosadodecaenyl, cyclotriacontadodecaenyl, cyclohexacosamidecaenyl, cycloheptacosamidecaenyl, cyclooctacosamidecaenyl, cyclononacosamidecaenyl, cyclotriacontamidecaenyl, cyclooctacosatetradecaenyl, cyclononacosatetradecaenyl, cyclotriacontatetradecaenyl, cyclotriacontapentadecaenyl, and the like; all isomers of polycyclic alkenes, and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar substituted polycyclic alkenes including: norbornenyl, norbornadienyl spiro[4.5]decenyl, spiro[5.7]tridecenyl, and the like; phenyl, and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar substituted phenyl including: methylphenyl, dimethylphenyl, trimethylphenyl, tetramethylphenyl, ethylphenyl, diethylphenyl, triethylphenyl, tetraethylphenyl, propylphenyl, dipropylphenyl, tripropylphenyl, tetrapropylphenyl, butylphenyl, dibutylphenyl, tributylphenyl, tetrabutylphenyl, hexylphenyl, dihexylphenyl, trihexylphenyl, tetrahexylphenyl, dimethylethylphenyl, dimethylpropylphenyl, dimethylbutylphenyl, dimethylpentylphenyl, dimethylhexylphenyl, diethylmethylphenyl, diethylpropylphenyl, diethylbutylphenyl, diethylpentylphenyl, diethylhexylphenyl, dipropylmethylphenyl, dipropylethylphenyl, dipropylbutylphenyl, dipropylpentylphenyl, dipropylhexylphenyl, dibutylmethylphenyl, dibutylethylphenyl, dibutylpropylphenyl, dibutylpentylphenyl, dibutylhexylphenyl, methylethylphenyl, methylpropylphenyl, methylbutylphenyl, methylpentylphenyl, methylhexylphenyl, ethylpropylphenyl, ethylbutylphenyl, ethylpentylphenyl, ethylhexylphenyl, propylbutylphenyl, propylpentylphenyl, propylhexylphenyl, butylpentylphenyl, butylhexylphenyl, methoxyphenyl, ethoxyphenyl, propoxyphenyl, butoxyphenyl, pentoxyphenyl, hexoxyphenyl, dimethoxyphenyl, phenoxyphenyl, methylmethoxyphenyl, dimethylaminophenyl, dipropylaminophenyl, bis(dimethylamino)phenyl, methyl(dimethylamino)phenyl, trimethylsilylphenyl, trimethylgermylphenyl, trifluoromethylphenyl, bis(trifluoromethyl)phenyl, trifluoromethoxyphenyl and the like; benzyl, and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar substituted benzyl including: methylbenzyl, dimethylbenzyl, trimethylbenzyl, tetramethylbenzyl, ethylbenzyl, diethylbenzyl, triethylbenzyl, tetraethylbenzyl, propylbenzyl, dipropylbenzyl, tripropylbenzyl, tetrapropylbenzyl, butylbenzyl, dibutylbenzyl, tributylbenzyl, tetrabutylbenzyl, hexylbenzyl, dihexylbenzyl, trihexylbenzyl, tetrahexylbenzyl, dimethylethylbenzyl, dimethylpropylbenzyl, dimethylbutylbenzyl, dimethylpentylbenzyl, dimethylhexylbenzyl, diethylmethylbenzyl, diethylpropylbenzyl, diethylbutylbenzyl, diethylpentylbenzyl, diethylhexylbenzyl, dipropylmethylbenzyl, dipropylethylbenzyl, dipropylbutylbenzyl, dipropylpentylbenzyl, dipropylhexylbenzyl, dibutylmethylbenzyl, dibutylethylbenzyl, dibutylpropylbenzyl, dibutylpentylbenzyl, dibutylhexylbenzyl, methylethylbenzyl, methylpropylbenzyl, methylbutylbenzyl, methylpentylbenzyl, methylhexylbenzyl, ethylpropylbenzyl, ethylbutylbenzyl, ethylpentylbenzyl, ethylhexylbenzyl, propylbutylbenzyl, propylpentylbenzyl, propylhexylbenzyl, butylpentylbenzyl, butylhexylbenzyl, methoxybenzyl, ethoxybenzyl, propoxybenzyl, butoxybenzyl, pentoxybenzyl, hexoxybenzyl, dimethoxybenzyl, phenoxybenzyl, methylmethoxybenzyl, dimethylaminobenzyl, dipropylaminobenzyl, bis(dimethylamino)benzyl, methyl(dimethylamino)benzyl, trifluoromethylbenzyl, bis(trifluoromethylbenzyl), trifluoromethyoxybenzyl, trimethylsilylbenzyl, bis(trimethylsilyl)benzyl, trimethylgermylbenzyl and the like; all isomers of polycyclic areneyls, and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar substituted polycyclic areneyls including: aceanthrylenyl, acenaphthylene, acephenanthrylenyl, anthracenyl, azulenyl, biphenylenyl, chrysenyl, coronenyl, fluoranthenyl, fluorenyl, heptacenyl, heptalenyl, heptaphenyl, hexacenyl, hexaphenyl, as-indacenyl, s-indecenyl, indenyl, naphthalenyl, ovalenyl, pentacenyl, pentalenyl, pentaphenyl, perylenyl, phenalenyl, phenanthrenyl, picenyl, pleiadenyl, pyranthrenyl, pyrenyl, rubicenyl, naphthacenyl, tetraphenylenyl, trinaphthylenyl, triphenylenyl, hexahelicenyl, dibenza[a,h]anthracenyl, indanyl, cholanthrenyl, aceanthrenyl, acephenanthrenyl, 1,2,3,4-tetrahydronaphthalenyl, 5,6-didehydroazulenyl, 1,4-dihydronaphthalenyl, 5H-cyclobut[e]indenyl, cyclohepta[k]phenanthrenyl, benz[e]acephenanthrylenyl, octalenyl, pentalene[1,6-cd]pentalenyl, cyclobut[c]indenyl, cyclopenta[l]phenanthrene, naphtha[2,1,8-cde]azulene, fullerenyl and the like; all isomers of substituted ring assemblies, and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar substituted ring assemblies including: biphenyl, terphenyl, binaphthyl, binorbornenyl, phenyl-terphenyl, phenyl-naphthyl, phenyl-anthracenyl, phenyl-phenanthrenyl, bianthracenyl, biphenanthrenyl, and the like; all isomers of bridged monocyclic and polycyclic arenyls, and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar substituted bridged monocyclic and polycyclic arenyls including: 1,1-diphenylmethano, 1,2-diphenylethano, 1,2-diphenyletheno, 1,2-dinaphthylethano, 1,2-dinaphthyletheno, 1,1-dinaphthylmethano, 1,1-dianthracenylmethano, 1,2-dianthracenylethano, 1,2-dianthracenyletheno and the like; all isomers of heterocycles, and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar substituted heterocycles including: acridarsinyl, acridinyl, acridophosphinyl, 1H-acrindolinyl, anthrazinyl, anthyridinyl, arsanthridinyl, arsindolyl, arsindolizinyl, arsinolinyl, arsinolizinyl, benzofuranyl, carbazolyl, 3-carbolinyl, chromenyl, thiochromenyl, cinnolinyl, furanyl, imidazolyl, indazolyl, indolyl, indolizinyl, isoarsindolyl, isoarsinolinyl, isobenzofuranyl, isochromenyl, isothiochromenyl, isoindolyl, isophosphindolyl, isophosphinolinyl, isoquinolinyl, isothiazolyl, isoxazolyl, naphthyridinyl, oxazolyl, perimidinyl, phenanthrazinyl, phenanthridinyl, phenanthrolinyl, phenazinyl, phosphanthridinyl, phosphindolyl, phosphindolizinyl, phosphinolizinyl, phthalazinyl, pteridinyl, phthaloperinyl, purinyl, pyranyl, thiopyranal, pyrazinyl, pyrazolyl, pyridazinyl, pyridinyl, pyrindinyl, pyrimidinyl, pyrrolyl, pyrrolizinyl, quinazolinyl, quindolinyl, 1H-quinindolinyl, quinolinyl, quinolizinyl, quinoxalinyl, selenophenyl, thebenidinyl, thiazolyl, thiophenyl, triphenodioxazinyl, triphenodithiazinyl, xanthenyl, chromanyl, thiochromanyl, indolinyl, isochromanyl, isothiochromanyl, isoindolinyl, bipyridyl, pyrido[2,1,6-de]quinolizinyl and the like.

When R″ a C₂-C₁₀₀ substituted, unsaturated or partially unsaturated, linear or branched alicyclic hydrocarbyl substituent, non-limiting examples of R″ include all isomers of alkenes and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar group substituted alkenes including: ethenyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl, heneicosenyl, docosenyl, tricosenyl, tetracosenyl, pentacosenyl, hexacosenyl, heptacosenyl, octacosenyl, nonacosenyl, triacontenyl, butadienyl, pentadienyl, hexadienyl, heptadienyl, octadienyl, nonadienyl, decadienyl, undecadienyl, dodecadienyl, tridecadienyl, tetradecadienyl, pentadecadienyl, hexadecadienyl, heptadecadienyl, octadecadienyl, nonadecadienyl, eicosadienyl, heneicosadienyl, docosadienyl, tricosadienyl, tetracosadienyl, pentacosadienyl, hexacosadienyl, heptacosadienyl, octacosadienyl, nonacosadienyl, triacontadienyl, hexatrienyl, heptatrienyl, octatrienyl, nonatrienyl, decatrienyl, undecatrienyl, dodecatrienyl, tridecatrienyl, tetradecatrienyl, pentadecatrienyl, hexadecatrienyl, heptadecatrienyl, octadecatrienyl, nonadecatrienyl, eicosatrienyl, heneicosatrienyl, docosatrienyl, tricosatrienyl, tetracosatrienyl, pentacosatrienyl, hexacosatrienyl, heptacosatrienyl, octacosatrienyl, nonacosatrienyl, triacontatrienyl, octatetrenyl, nonatetrenyl, decatetrenyl, undecatetrenyl, dodecatetrenyl, tridecatetrenyl, tetradecatetrenyl, pentadecatetrenyl, hexadecatetrenyl, heptadecatetrenyl, octadecatetrenyl, nonadecatetrenyl, eicosatetrenyl, heneicosatetrenyl, docosatetrenyl, tricosatetrenyl, tetracosatetrenyl, pentacosatetrenyl, hexacosatetrenyl, heptacosatetrenyl, octacosatetrenyl, nonacosatetrenyl, triacontatetrenyl, decapentaenyl, undecapentaenyl, dodecapentaenyl, tridecapentaenyl, tetradecapentaenyl, pentadecapentaenyl, hexadecapentaenyl, heptadecapentaenyl, octadecapentaenyl, nonadecapentaenyl, eicosapentaenyl, heneicosapentaenyl, docosapentaenyl, tricosapentaenyl, tetracosapentaenyl, pentacosapentaenyl, hexacosapentaenyl, heptacosapentaenyl, octacosapentaenyl, nonacosapentaenyl, triacontapentaenyl, dodecahexaenyl, tridecahexaenyl, tetradecahexaenyl, pentadecahexaenyl, hexadecahexaenyl, heptadecahexaenyl, octadecahexaenyl, nonadecahexaenyl, eicosahexaenyl, heneicosahexaenyl, docosahexaenyl, tricosahexaenyl, tetracosahexaenyl, pentacosahexaenyl, hexacosahexaenyl, heptacosahexaenyl, octacosahexaenyl, nonacosahexaenyl, triacontahexaenyl, tetradecaheptaenyl, pentadecaheptaenyl, hexadecaheptaenyl, heptadecaheptaenyl, octadecaheptaenyl, nonadecaheptaenyl, eicosaheptaenyl, heneicosaheptaenyl, docosaheptaenyl, tricosaheptaenyl, tetracosaheptaenyl, pentacosaheptaenyl, hexacosaheptaenyl, heptacosaheptaenyl, octacosaheptaenyl, nonacosaheptaenyl, triacontaheptaenyl, hexadecaoctaenyl, heptadecaoctaenyl, octadecaoctaenyl, nonadecaoctaenyl, eicosaoctaenyl, heneicosaoctaenyl, docosaoctaenyl, tricosaoctaenyl, tetracosaoctaenyl, pentacosaoctaenyl, hexacosaoctaenyl, heptacosaoctaenyl, octacosaoctaenyl, nonacosaoctaenyl, triacontaoctaenyl, octadecanonaenyl, nonadecanonaenyl, eicosanonaenyl, heneicosanonaenyl, docosanonaenyl, tricosanonaenyl, tetracosanonaenyl, pentacosanonaenyl, hexacosanonaenyl, heptacosanonaenyl, octacosanonaenyl, nonacosanonaenyl, triacontanonaenyl, eicosadecaenyl, heneicosadecaenyl, docosadecaenyl, tricosadecaenyl, tetracosadecaenyl, pentacosadecaenyl, hexacosadecaenyl, heptacosadecaenyl, octacosadecaenyl, nonacosadecaenyl, triacontadecaenyl, docosaundecaenyl, tricosaundecaenyl, tetracosaundecaenyl, pentacosaundecaenyl, hexacosaundecaenyl, heptacosaundecaenyl, octacosaundecaenyl, nonacosaundecaenyl, triacontaundecaenyl, tetracosadodecaenyl, pentacosadodecaenyl, hexacosadodecaenyl, heptacosadodecaenyl, octacosadodecaenyl, nonacosadodecaenyl, triacontadodecaenyl, hexacosamidecaenyl, heptacosamidecaenyl, octacosamidecaenyl, nonacosamidecaenyl, triacontamidecaenyl, octacosatetradecaenyl, nonacosatetradecaenyl, triacontatetradecaenyl, triacontapentadecaenyl, cyclopentylidene, cyclohexylidene, cycloheptylidene, cyclooctylidene, cyclononylidene, cyclodecylidene, cycloundecylidene, cyclododecylidene, and the like.

When R″ is a C₁-C₁₀₀ substituted or unsubstituted saturated hydrocarbyl radical, non-limiting examples of R″ include methyl, ethyl, and all isomers of propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, and triacontyl; cyclopropyl, and all isomers of cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclononyl, cyclodecyl, cycloundecyl, cyclododecyl, cyclotridecyl, cyclotetradecyl, cyclopentadecyl, cyclohexadecyl, cycloheptadecyl, cyclooctadecyl, cyclononadecyl, cycloeicosyl, cycloheneicosyl, cyclodocosyl, cyclotricosyl, cyclotetracosyl, cyclopentacosyl, cyclohexacosyl, cycloheptacosyl, cyclooctacosyl, cyclononacosyl, and cyclotriacontyl; all isomers of norbornyl, adamantyl, cubanyl, prismanyl, and spiro[4,5]decanyl; pefluoromethyl, perfluoroethyl, and all isomers of perfluoropropyl, perfluorobutyl, perfluoropentyl, perfluorohexyl, perfluoroheptyl, perfluorooctyl, perfluorononyl, perfluorodecyl, perfluoroundecyl, perfluorododecyl, perfluorotridecyl, perfluorotetradecyl, perfluoropentadecyl, perfluorohexadecyl, perfluoroheptadecyl, perfluorooctadecyl, perfluorononadecyl, perfluoroeicosyl, perfluoroheneicosyl, perfluorodocosyl, perfluorotricosyl, perfluorotetracosyl, perfluoropentacosyl, perfluorohexacosyl, perfluoroheptacosyl, perfluorooctacosyl, perfluorononacosyl, and perfluorotriacontyl; fluoromethyl, and all isomers of fluoroethyl, fluoropropyl, fluorobutyl, fluoropentyl, fluorohexyl, fluoroheptyl, fluorooctyl, fluorononyl, fluorodecyl, perfluoroundecyl, fluorododecyl, fluorotridecyl, fluorotetradecyl, fluoropentadecyl, fluorohexadecyl, fluoroheptadecyl, fluorooctadecyl, fluorononadecyl, fluoroeicosyl, fluoroheneicosyl, fluorodocosyl, fluorotricosyl, fluorotetracosyl, fluoropentacosyl, fluorohexacosyl, fluoroheptacosyl, fluorooctacosyl, fluorononacosyl, and fluorotriacontyl; methoxymethyl, ethoxymethyl, and all isomers of methoxyethyl, methoxypropyl, methoxybutyl, methoxypentyl, methoxyhexyl, methoxyheptyl, methoxyoctyl, methoxynonyl, methoxydecyl, methoxyundecyl, methoxydodecyl, methoxytridecyl, methoxytetradecyl, methoxypentadecyl, methoxyhexadecyl, methoxyheptadecyl, methoxyoctadecyl, methoxynonadecyl, methoxyeicosyl, methoxyheneicosyl, methoxydocosyl, methoxytricosyl, methoxytetracosyl, methoxypentacosyl, methoxyhexacosyl, methoxyheptacosyl, methoxyoctacosyl, methoxynonacosyl, methoxytriacontyl, ethoxyethyl, ethoxypropyl, ethoxybutyl, ethoxypentyl, ethoxyhexyl, ethoxyheptyl, ethoxyoctyl, ethoxynonyl, ethoxydecyl, ethoxyundecyl, ethoxydodecyl, ethoxytridecyl, ethoxytetradecyl, ethoxypentadecyl, ethoxyhexadecyl, ethoxyheptadecyl, ethoxyoctadecyl, ethoxynonadecyl, ethoxyeicosyl, ethoxyheneicosyl, ethoxydocosyl, ethoxytricosyl, ethoxytetracosyl, ethoxypentacosyl, ethoxyhexacosyl, ethoxyheptacosyl, ethoxyoctacosyl, ethoxynonacosyl, ethoxytriacontyl, propoxymethyl, propoxyethyl, propoxypropyl, propoxybutyl, propoxypentyl, propoxyhexyl, propoxyheptyl, propoxyoctyl, propoxynonyl, propoxydecyl, propoxyundecyl, propoxydodecyl, propoxytridecyl, propoxytetradecyl, propoxypentadecyl, propoxyhexadecyl, propoxyheptadecyl, propoxyoctadecyl, propoxynonadecyl, propoxyeicosyl, propoxyheneicosyl, propoxydocosyl, propoxytricosyl, propoxytetracosyl, propoxypentacosyl, propoxyhexacosyl, propoxyheptacosyl, propoxyoctacosyl, propoxynonacosyl, propoxytriacontyl, butoxymethyl, butoxyethyl, butoxypropyl, butoxybutyl, butoxypentyl, butoxyhexyl, butoxyheptyl, butoxyoctyl, butoxynonyl, butoxydecyl, butoxyundecyl, butoxydodecyl, butoxytridecyl, butoxytetradecyl, butoxypentadecyli, butoxyhexadecyl, butoxyheptadecyl, butoxyoctadecyl, butoxynonadecyl, butoxyeicosyl, butoxyheneicosyl, butoxydocosyl, butoxytricosyl, butoxytetracosyl, butoxypentacosyl, butoxyhexacosyl, butoxyheptacosyl, butoxyoctacosyl, butoxynonacosyl, and butoxytriacontyl; dimethylaminomethyl, and all isomers of dimethylaminoethyl, dimethylaminopropyl, dimethylaminobutyl, dimethylaminopentyl, dimethylaminohexyl, dimethylaminoheptyl, dimethylaminooctyl, dimethylaminononyl, dimethylaminodecyl, dimethylaminoundecyl, dimethylaminododecyl, dimethylaminotridecyl, dimethylaminotetradecyl, dimethylaminopentadecyl, dimethylaminohexadecyl, dimethylaminoheptadecyl, dimethylaminooctadecyl, dimethylaminononadecyl, dimethylaminoeicosyl, dimethylaminoheneicosyl, dimethylaminodocosyl, dimethylaminotricosyl, dimethylaminotetracosyl, dimethylaminopentacosyl, dimethylaminohexacosyl, dimethylaminoheptacosyl, dimethylaminooctacosyl, dimethylaminononacosyl, and dimethylaminotriacontyl; trimethylsilylmethyl, and all isomers of trimethylsilylethyl, trimethylsilylpropyl, trimethylsilylbutyl, trimethylsilylpentyl, trimethylsilylhexyl, trimethylsilylheptyl, trimethylsilyloctyl, trimethylsilylnonyl, trimethylsilyldecyl, trimethylsilylundecyl, trimethylsilyldodecyl, trimethylsilyltridecyl, trimethylsilyltetradecyl, trimethylsilylpentadecyl, trimethylsilylhexadecyl, trimethylsilylheptadecyl, trimethylsilyloctadecyl, trimethylsilylnonadecyl, trimethylsilyleicosyl, trimethylsilylheneicosyl, trimethylsilyldocosyl, trimethylsilyltricosyl, trimethylsilyltetracosyl, trimethylsilylpentacosyl, trimethylsilylhexacosyl, trimethylsilylheptacosyl, trimethylsilyloctacosyl, trimethylsilylnonacosyl, and trimethylsilyltriacontyl; trimethylgermylmethyl, and all isomers of trimethylgermylethyl, trimethylgermylpropyl, trimethylgermylbutyl, trimethylgermylpentyl, trimethylgermylhexyl, trimethylgermylheptyl, trimethylgermyloctyl, trimethylgermylnonyl, trimethylgermyldecyl, trimethylgermylundecyl, trimethylgermyldodecyl, trimethylgermyltridecyl, trimethylgermyltetradecyl, trimethylgermylpentadecyl, trimethylgermylhexadecyl, trimethylgermylheptadecyl, trimethylgermyloctadecyl, trimethylgermylnonadecyl, trimethylgermyleicosyl, trimethylgermylheneicosyl, trimethylgermyldocosyl, trimethylgermyltricosyl, trimethylgermyltetracosyl, trimethylgermylpentacosyl, trimethylgermylhexacosyl, trimethylgermylheptacosyl, trimethylgermyloctacosyl, trimethylgermylnonacosyl, and trimethylgermyltriacontyl

Preferably, R″ is selected from methyl, ethyl, all propyl isomers, all butyl isomers, phenyl, benzyl, phenethyl, 1-adamantyl, cyclododecyl, cyclohexyl and norbornyl.

When present, Y is a bridging group containing boron or a Group 14, 15 or 16 element. Examples of suitable bridging groups include R′₂C, R′₂Si, R′₂Ge, R′₂CCR′₂, R′₂CCR′₂CR′₂, R′₂CCR′₂CR′₂CR′₂, R′C═CR′, R′C═CR′CR′₂, R′₂CCR′═CR′CR′₂, R′C═CR′CR′═CR′, R′C═CR′CR′₂CR′₂, R′₂CSiR′₂, R′₂SiSiR′₂, R′₂CSiR′₂CR′₂, R′₂SiCR′₂SiR′₂, R′C═CR′SiR′₂, R′₂CGeR′₂, R′₂GeGeR′₂, R′₂CGeR′₂CR′₂, R′₂GeCR′₂GeR′₂, R′₂SiGeR′₂, R′C═CR′GeR′₂, R′B, R′₂C—BR′, R′₂C—BR′—CR′₂, R′₂C—O—CR′₂, R′₂CR′₂C—O—CR′₂CR′₂, R′₂C—O—CR′₂CR′₂, R′₂C—O—CR′═CR′, R′₂C—S—CR′₂, R′₂CR′₂C—S—CR′₂CR′₂, R′₂C—S—CR′₂CR′₂, R′₂C—S—CR′═CR′, R′₂C—Se—CR′₂, R′₂CR′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′═CR′, R′₂C—N═CR′, R′₂C—NR′—CR′₂, R′₂C—NR′—CR′₂CR′₂, R′₂C—NR′—CR′═CR′, R′₂CR′₂C—NR′—CR′₂CR′₂, R′₂C—P═CR′, and R′₂C—PR′—CR′₂ where R′ is hydrogen or a C₁-C₂₀ containing hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl or germylcarbyl substituent and optionally two or more adjacent R′ may join to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic, cyclic or polycyclic substituent. Preferred examples for the bridging group Y include CH₂, CH₂CH₂, C(CH₃)₂, SiMe₂, SiPh₂, SiMePh, Si(CH₂)₃ and Si(CH₂)₄.

Conveniently, A includes an aromatic five-membered ring pi-bonded to M. Preferably, A is a substituted heterocyclopentadienyl ligand, a substituted heteroindenyl ligand, a substituted heterofluorenyl ligand, or a substituted heterocyclopentanaphthyl ligand.

Preferred examples of the ligand A include substituted arsacyclopentadienyl ligands, substituted azaboratabenzene ligands, substituted azaborindenyl ligands, substituted azaborollide ligands, substituted azacyclopentadienyl ligands, substituted benzothiaborollide ligands, substituted boratabenzene ligands, substituted boracyclopentadienyl ligands, substituted cyclopentathienyl ligands, substituted cyclopentabenzothienyl ligands, substituted cyclopentafuryl ligands, substituted cyclopentapyrrolyl ligands, substituted cyclopentapyridyl ligands, substituted cyclopentaphospholyl ligands, substituted cyclopentaphosphinyl ligands, substituted cyclopentaindolyl ligands, substituted cyclopentaquinolyl ligands, substituted indenodioxolyl ligands, substituted indenothienyl ligands, substituted indenopyridyl ligands, substituted indenophosphinyl ligands, substituted indenofuryl ligands, substituted indenobenzothienyl ligands, substituted indenoindolyl ligands, substituted oxaborollide ligands, substituted phosphaboratabenzene ligands, substituted stibacyclopentadienyl ligands and substituted thiaborollide ligands.

Preferably, the or each halogen substituent is a chloro, bromo or iodo substituent, and more preferably is a chloro or bromo substituent.

Examples of metallocene compounds according to said fourth embodiment include:

-   dimethylsilanediyl(8-bromo-6-methylindeno[5,6-d][1,3]dioxol-5-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(4-bromo-2,3,6-trimethylindeno[5,6-b]thien-7-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(2-bromo-4,6-dimethylindeno[5,6-b]thien-7-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(4-bromo-1,2,3,6-tetramethylcyclopenta[f]indol-7-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(4-bromo-1-phenyl-2,3,6-triamethylcyclopenta[f]indol-7-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(5-bromo-7-methylcyclopenta[g]quinol-8-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(2-bromo-5,7-dimethylcyclopenta[g]quinol-8-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(3-bromo-5-methylcyclopenta[b]thien-6-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(1-chlorocyclopenta[c]thien-4-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(8-bromo-2-methylcyclopenta[b][1]benzothien-1-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(8-chloro-2-methylcyclopenta[b][1]benzothien-1-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(8-iodo-2-methylcyclopenta[b][1]benzothien-1-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(3-bromo-5-methylcyclopenta[b]fur-6-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(2-bromo-1,5-dimethylcyclopenta[b]pyrrol-4-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(2-bromo-5-methyl-1-phenylcyclopenta[b]pyrrol-4-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(2-chloro-5-methyl-1-phenylcyclopenta[b]pyrrol-4-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(2-iodo-5-methyl-1-phenylcyclopenta[b]pyrrol-4-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(2-bromo-1,5-dimethylcyclopenta[b]phosphol-4-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(5-bromo-2,4-dimethylcyclopenta[b]indol-1-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(4-bromocyclopenta[b]pyrid-5-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(4-bromocyclopenta[b]phosphin-5-yl)(N-tert-butylamido)zirconium     dichloride, -   4,N′-dimethylsilanediyl(2,6-dibromo-1-dimethylamino-1-boratabenzene)(N-tert-butylamido)zirconium     dichloride, -   2,N′-dimethylsilanediyl(4-bromo-3-dimethylamino-1,3-benzothiaborollide)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(4-bromo-3a,7a-azaborinden-1-yl)(N-tert-butylamido)zirconium     dichloride, -   4,N′-dimethylsilanediyl(3-bromo-2-dimethylamino-1,2-thiaborollide)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(2-[5-bromothien-2-yl]-inden-1-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(2-[4-bromopyrid-2-yl]-inden-1-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(7-bromoindeno[1,2-c]pyrid-5-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(3-bromoindeno[1,2-c]pyrid-5-yl)(N-tert-butylamido)zirconium     dichloride. -   dimethylsilanediyl(7-bromoindeno[1,2-c]phosphin-5-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(2-bromoindeno[1,2-b]thien-4-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(6-bromoindeno[2,1-b]thien-8-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(6-bromoindeno[1,2-c]thien-8-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(6-bromo-2,3-dimethylindeno[1,2-b]furan-4-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(2-bromoindeno[1,2-b][1]benzothien-10-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(8-bromoindeno[1,2-b][1]benzothien-10-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(8-bromoindeno[2,1-b][1]benzothien-6-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(3-bromoindeno[2,1-b][1]benzothien-6-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(2-bromo-5-methylindeno[1,2-b]indol-10-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(8-bromo-5-methylindeno[1,2-b]indol-10-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(8-bromo-5-methylindeno[2,1-b]indol-6-yl)(N-tert-butylamido)zirconium     dichloride, -   dimethylsilanediyl(3-bromo-5-methylindeno[2,1-b]indol-6-yl)(N-tert-butylamido)zirconium     dichloride, and     the hafnium and titanium analogs of the examples above.

In a fifth embodiment, the invention provides a metallocene compound represented by the formula (5):

wherein M is a Group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom, preferably a Group 4 transition metal atom selected from titanium, zirconium or hafnium; A is a substituted or unsubstituted monocyclic or polycyclic ligand pi-bonded to M, wherein A includes one or more ring heteroatoms selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; Y is an optional bridging group that is bonded to A and T, and is present when y is one and absent when y is zero; y is zero or one; and T is a heteroatom with a coordination number of three from Group 15 or with a coordination number of two from Group 16 of the Periodic Table of Elements; R′″ is selected from a C₃-C₁₀₀ substituted monocyclic or polycyclic ring structure substituent that is partially unsaturated, unsaturated or aromatic; or a C₂-C₁₀₀ substituted, unsaturated or partially unsaturated, linear or branched alicyclic hydrocarbyl substituent; and R′″ is substituted with at least one halogen substituent bonded to an sp² carbon atom; t is the coordination number of the heteroatom T where “t-1-y” indicates the number of R′″ substituents bonded to T and is at least one; each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand.

Conveniently, t-1-y is equal to 1 and preferably T is a nitrogen atom.

When R′″ is a C₃-C₁₀₀ substituted monocyclic or polycyclic ring structure substituent that is partially unsaturated, unsaturated or aromatic, and R′″ is substituted with at least one halogen substituent selected from chloro, bromo, and iodo, said halogen substituent is bonded to a sp² carbon atom, non-limiting examples of R′″ include all isomers of halocycloalkenes, and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar group substituted halocycloalkenes where the halogen radical (halo) is bromo, chloro or iodo and is bonded to an sp² carbon atom of the halocycloalkene including: halocyclopropenyl, halocyclobutenyl, halocyclopentenyl, halocyclohexenyl, halocycloheptenyl, halocyclooctenyl, halocyclononenyl, halocyclodecenyl, halocycloundecenyl, halocyclododecenyl, halocyclotridecenyl, halocyclotetradecenyl, halocyclopentadecenyl, halocyclohexadecenyl, halocycloheptadecenyl, halocyclooctadecenyl, halocyclononadecenyl, halocycloeicosenyl, halocycloheneicosenyl, halocyclodocosenyl, halocyclotricosenyl, halocyclotetracosenyl, halocyclopentacosenyl, halocyclohexacosenyl, halocycloheptacosenyl, halocyclooctacosenyl, halocyclononacosenyl, halocyclotriacontenyl, halocyclobutadienyl, halocyclopentadienyl, halocyclohexadienyl, halocycloheptadienyl, halocyclooctadienyl, halocyclononadienyl, halocyclodecadienyl, halocycloundecadienyl, halocyclododecadienyl, halocyclotridecadienyl, halocyclotetradecadienyl, halocyclopentadecadienyl, halocyclohexadecadienyl, halocycloheptadecadienyl, halocyclooctadecadienyl, halocyclononadecadienyl, halocycloeicosadienyl, halocycloheneicosadienyl, halocyclodocosadienyl, halocyclotricosadienyl, halocyclotetracosadienyl, halocyclopentacosadienyl, halocyclohexacosadienyl, halocycloheptacosadienyl, halocyclooctacosadienyl, halocyclononacosadienyl, halocyclotriacontadienyl, halocyclohexatrienyl, halocycloheptatrienyl, halocyclooctatrienyl, halocyclononatrienyl, halocyclodecatrienyl, halocycloundecatrienyl, halocyclododecatrienyl, halocyclotridecatrienyl, halocyclotetradecatrienyl, halocyclopentadecatrienyl, halocyclohexadecatrienyl, halocycloheptadecatrienyl, halocyclooctadecatrienyl, halocyclononadecatrienyl, halocycloeicosatrienyl, halocycloheneicosatrienyl, halocyclodocosatrienyl, halocyclotricosatrienyl, halocyclotetracosatrienyl, halocyclopentacosatrienyl, halocyclohexacosatrienyl, halocycloheptacosatrienyl, halocyclooctacosatrienyl, halocyclononacosatrienyl, halocyclotriacontatrienyl, halocyclooctatetrenyl, halocyclononatetrenyl, halocyclodecatetrenyl, halocycloundecatetrenyl, halocyclododecatetrenyl, halocyclotridecatetrenyl, halocyclotetradecatetrenyl, halocyclopentadecatetrenyl, halocyclohexadecatetrenyl, halocycloheptadecatetrenyl, halocyclooctadecatetrenyl, halocyclononadecatetrenyl, halocycloeicosatetrenyl, halocycloheneicosatetrenyl, halocyclodocosatetrenyl, halocyclotricosatetrenyl, halocyclotetracosatetrenyl, halocyclopentacosatetrenyl, halocyclohexacosatetrenyl, halocycloheptacosatetrenyl, halocyclooctacosatetrenyl, halocyclononacosatetrenyl, halocyclotriacontatetrenyl, halocyclodecapentaenyl, halocycloundecapentaenyl, halocyclododecapentaenyl, halocyclotridecapentaenyl, halocyclotetradecapentaenyl, halocyclopentadecapentaenyl, halocyclohexadecapentaenyl, halocycloheptadecapentaenyl, halocyclooctadecapentaenyl, halocyclononadecapentaenyl, halocycloeicosapentaenyl, halocycloheneicosapentaenyl, halocyclodocosapentaenyl, halocyclotricosapentaenyl, halocyclotetracosapentaenyl, halocyclopentacosapentaenyl, halocyclohexacosapentaenyl, halocycloheptacosapentaenyl, halocyclooctacosapentaenyl, halocyclononacosapentaenyl, halocyclotriacontapentaenyl, halocyclododecahexaenyl, halocyclotridecahexaenyl, halocyclotetradecahexaenyl, halocyclopentadecahexaenyl, halocyclohexadecahexaenyl, halocycloheptadecahexaenyl, halocyclooctadecahexaenyl, halocyclononadecahexaenyl, halocycloeicosahexaenyl, halocycloheneicosahexaenyl, halocyclodocosahexaenyl, halocyclotricosahexaenyl, halocyclotetracosahexaenyl, halocyclopentacosahexaenyl, halocyclohexacosahexaenyl, halocycloheptacosahexaenyl, halocyclooctacosahexaenyl, halocyclononacosahexaenyl, halocyclotriacontahexaenyl, halocyclotetradecaheptaenyl, halocyclopentadecaheptaenyl, halocyclohexadecaheptaenyl, halocycloheptadecaheptaenyl, halocyclooctadecaheptaenyl, halocyclononadecaheptaenyl, halocycloeicosaheptaenyl, halocycloheneicosaheptaenyl, halocyclodocosaheptaenyl, halocyclotricosaheptaenyl, halocyclotetracosaheptaenyl, halocyclopentacosaheptaenyl, halocyclohexacosaheptaenyl, halocycloheptacosaheptaenyl, halocyclooctacosaheptaenyl, halocyclononacosaheptaenyl, halocyclotriacontaheptaenyl, halocyclohexadecaoctaenyl, halocycloheptadecaoctaenyl, halocyclooctadecaoctaenyl, halocyclononadecaoctaenyl, halocycloeicosaoctaenyl, halocycloheneicosaoctaenyl, halocyclodocosaoctaenyl, halocyclotricosaoctaenyl, halocyclotetracosaoctaenyl, halocyclopentacosaoctaenyl, halocyclohexacosaoctaenyl, halocycloheptacosaoctaenyl, halocyclooctacosaoctaenyl, halocyclononacosaoctaenyl, halocyclotriacontaoctaenyl, halocyclooctadecanonaenyl, halocyclononadecanonaenyl, halocycloeicosanonaenyl, halocycloheneicosanonaenyl, halocyclodocosanonaenyl, halocyclotricosanonaenyl, halocyclotetracosanonaenyl, halocyclopentacosanonaenyl, halocyclohexacosanonaenyl, halocycloheptacosanonaenyl, halocyclooctacosanonaenyl, halocyclononacosanonaenyl, halocyclotriacontanonaenyl, halocycloeicosadecaenyl, halocycloheneicosadecaenyl, halocyclodocosadecaenyl, halocyclotricosadecaenyl, halocyclotetracosadecaenyl, halocyclopentacosadecaenyl, halocyclohexacosadecaenyl, halocycloheptacosadecaenyl, halocyclooctacosadecaenyl, halocyclononacosadecaenyl, halocyclotriacontadecaenyl, halocyclodocosaundecaenyl, halocyclotricosaundecaenyl, halocyclotetracosaundecaenyl, halocyclopentacosaundecaenyl, halocyclohexacosaundecaenyl, halocycloheptacosaundecaenyl, halocyclooctacosaundecaenyl, halocyclononacosaundecaenyl, halocyclotriacontaundecaenyl, halocyclotetracosadodecaenyl, halocyclopentacosadodecaenyl, halocyclohexacosadodecaenyl, halocycloheptacosadodecaenyl, halocyclooctacosadodecaenyl, halocyclononacosadodecaenyl, halocyclotriacontadodecaenyl, halocyclohexacosamidecaenyl, halocycloheptacosamidecaenyl, halocyclooctacosamidecaenyl, halocyclononacosamidecaenyl, halocyclotriacontamidecaenyl, halocyclooctacosatetradecaenyl, halocyclononacosatetradecaenyl, halocyclotriacontatetradecaenyl, halocyclotriacontapentadecaenyl, and the like; all isomers of polycyclic haloalkenes, and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar substituted polycyclic haloalkenes where the halogen radical (halo) is bromo, chloro or iodo and is bonded to an sp² carbon atom of the polycyclic haloalkene including: halonorbornenyl, halonorbornadienyl halospiro[4.5]decenyl, halospiro[5.7]tridecenyl, and the like; all isomers of halophenyl, and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar substituted halophenyls where the halogen radical (halo) is bromo, chloro or iodo and is bonded to an sp² carbon atom of the halophenyl including: halomethylphenyl, halodimethylphenyl, halotrimethylphenyl, halotetramethylphenyl, haloethylphenyl, halodiethylphenyl, halotriethylphenyl, halotetraethylphenyl, halopropylphenyl, halodipropylphenyl, halotripropylphenyl, halotetrapropylphenyl, halobutylphenyl, halodibutylphenyl, halotributylphenyl, halotetrabutylphenyl, halohexylphenyl, halodihexylphenyl, halotrihexylphenyl, halotetrahexylphenyl, halodimethylethylphenyl, halodimethylpropylphenyl, halodimethylbutylphenyl, halodimethylpentylphenyl, halodimethylhexylphenyl, halodiethylmethylphenyl, halodiethylpropylphenyl, halodiethylbutylphenyl, halodiethylpentylphenyl, halodiethylhexylphenyl, halodipropylmethylphenyl, halodipropylethylphenyl, halodipropylbutylphenyl, halodipropylpentylphenyl, halodipropylhexylphenyl, halodibutylmethylphenyl, halodibutylethylphenyl, halodibutylpropylphenyl, halodibutylpentylphenyl, halodibutylhexylphenyl, halomethylethylphenyl, halomethylpropylphenyl, halomethylbutylphenyl, halomethylpentylphenyl, halomethylhexylphenyl, haloethylpropylphenyl, haloethylbutylphenyl, haloethylpentylphenyl, haloethylhexylphenyl, halopropylbutylphenyl, halopropylpentylphenyl, halopropylhexylphenyl, halobutylpentylphenyl, halobutylhexylphenyl, halomethoxyphenyl, haloethoxyphenyl, halopropoxyphenyl, halobutoxyphenyl, halopentoxyphenyl, halohexoxyphenyl, halodimethoxyphenyl, halophenoxyphenyl, halomethylmethoxyphenyl, halodimethylaminophenyl, halodipropylaminophenyl, halobis(dimethylamino)phenyl, halomethyl(dimethylamino)phenyl, halotrimethylsilylphenyl, halotrimethylgermylphenyl, halotrifluoromethylphenyl, halobis(trifluoromethyl)phenyl, halotrifluoromethoxyphenyl and the like; all isomers of halobenzyl, and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar substituted halobenzyl where the halogen radical (halo) is bromo, chloro or iodo and is bonded to an sp² carbon atom of the halobenzyl including: halomethylbenzyl, halodimethylbenzyl, halotrimethylbenzyl, halotetramethylbenzyl, haloethylbenzyl, halodiethylbenzyl, halotriethylbenzyl, halotetraethylbenzyl, halopropylbenzyl, halodipropylbenzyl, halotripropylbenzyl, halotetrapropylbenzyl, halobutylbenzyl, halodibutylbenzyl, halotributylbenzyl, halotetrabutylbenzyl, halohexylbenzyl, halodihexylbenzyl, halotrihexylbenzyl, halotetrahexylbenzyl, halodimethylethylbenzyl, halodimethylpropylbenzyl, halodimethylbutylbenzyl, halodimethylpentylbenzyl, halodimethylhexylbenzyl, halodiethylmethylbenzyl, halodiethylpropylbenzyl, halodiethylbutylbenzyl, halodiethylpentylbenzyl, halodiethylhexylbenzyl, halodipropylmethylbenzyl, halodipropylethylbenzyl, halodipropylbutylbenzyl, halodipropylpentylbenzyl, halodipropylhexylbenzyl, halodibutylmethylbenzyl, halodibutylethylbenzyl, halodibutylpropylbenzyl, halodibutylpentylbenzyl, halodibutylhexylbenzyl, halomethylethylbenzyl, halomethylpropylbenzyl, halomethylbutylbenzyl, halomethylpentylbenzyl, halomethylhexylbenzyl, haloethylpropylbenzyl, haloethylbutylbenzyl, haloethylpentylbenzyl, haloethylhexylbenzyl, halopropylbutylbenzyl, halopropylpentylbenzyl, halopropylhexylbenzyl, halobutylpentylbenzyl, halobutylhexylbenzyl, halomethoxybenzyl, haloethoxybenzyl, halopropoxybenzyl, halobutoxybenzyl, halopentoxybenzyl, halohexoxybenzyl, halodimethoxybenzyl, halophenoxybenzyl, halomethylmethoxybenzyl, halodimethylaminobenzyl, halodipropylaminobenzyl, halobis(dimethylamino)benzyl, halomethyl(dimethylamino)benzyl, halotrifluoromethylbenzyl, halobis(trifluoromethylbenzyl), halotrifluoromethyoxybenzyl, halotrimethylsilylbenzyl, halobis(trimethylsilyl)benzyl, halotrimethylgermylbenzyl and the like; all isomers of polycyclic haloareneyls, and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar substituted polycyclic haloareneyls where the halogen radical (halo) is bromo, chloro or iodo and is bonded to an sp² carbon atom of the polycyclic haloarenyl including: haloaceanthrylenyl, haloacenaphthylene, haloacephenanthrylenyl, haloanthracenyl, haloazulenyl, halobiphenylenyl, halochrysenyl, halocoronenyl, halofluoranthenyl, halofluorenyl, haloheptacenyl, haloheptalenyl, haloheptaphenyl, halohexacenyl, halohexaphenyl, halo-as-indacenyl, halo-s-indecenyl, haloindenyl, halonaphthalenyl, haloovalenyl, halopentacenyl, halopentalenyl, halopentaphenyl, haloperylenyl, halophenalenyl, halophenanthrenyl, halopicenyl, halopleiadenyl, halopyranthrenyl, halopyrenyl, halo rubicenyl, halonaphthacenyl, halotetraphenylenyl, halotrinaphthylenyl, halotriphenylenyl, halohexahelicenyl, halodibenza[a,h]anthracenyl, haloindanyl, halocholanthrenyl, haloaceanthrenyl, haloacephenanthrenyl, halo-1,2,3,4-tetrahydronaphthalenyl, halo-5,6-didehydroazulenyl, halo-1,4-dihydronaphthalenyl, halo-5H-cyclobut[e]indenyl, halocyclohepta[k]phenanthrenyl, halobenz[e]acephenanthrylenyl, halooctalenyl, halopentalene[1,6-cd]pentalenyl, halocyclobut[c]indenyl, halocyclopenta[/]phenanthrene, halonaphtha[2,1,8-cde]azulene, halofullerenyl and the like; all isomers of substituted halo-substituted ring assemblies, and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar substituted halo-substituted ring assemblies where the halogen radical (halo) is bromo, chloro or iodo and is bonded to an sp² carbon atom of substituted halo-substituted ring assembly including: halo-biphenyl, halo-terphenyl, halo-binaphthyl, halo-binorbornenyl, halo-phenyl-terphenyl, halo-phenyl-naphthyl, halo-phenyl-anthracenyl, halo-phenyl-phenanthrenyl, halo-bianthracenyl, halo-biphenanthrenyl, and the like; all isomers of bridged monocyclic and polycyclic haloarenyls, and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar substituted bridged monocyclic and polycyclic haloarenyls where the halogen radical (halo) is bromo, chloro or iodo and is bonded to an sp² carbon atom of the bridged monocyclic and polycyclic haloarenyl including: 1,1-halodiphenylmethano, 1,2-halodiphenylethano, 1,2-halodiphenyletheno, 1,2-halodinaphthylethano, 1,2-halodinaphthyletheno, 1,1-halodinaphthylmethano, 1,1-halodianthracenylmethano, 1,2-halodianthracenylethano, 1,2-halodianthracenyletheno and the like; all isomers of haloheterocycles, and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar substituted haloheterocycles where the halogen radical (halo) is bromo, chloro or iodo and is bonded to an sp² carbon atom of the haloheterocycle including: haloacridarsinyl, haloacridinyl, haloacridophosphinyl, halo-1H-acrindolinyl, haloanthrazinyl, haloanthyridinyl, haloarsanthridinyl, haloarsindolyl, haloarsindolizinyl, haloarsinolinyl, haloarsinolizinyl, halobenzofuranyl, halocarbazolyl, halo-3-carbolinyl, halochromenyl, halothiochromenyl, halocinnolinyl, halofuranyl, haloimidazolyl, haloindazolyl, haloindolyl, haloindolizinyl, haloisoarsindolyl, haloisoarsinolinyl, haloisobenzofuranyl, haloisochromenyl, haloisothiochromenyl, haloisoindolyl, haloisophosphindolyl, haloisophosphinolinyl, haloisoquinolinyl, haloisothiazolyl, haloisoxazolyl, halonaphthyridinyl, halooxazolyl, haloperimidinyl, halophenanthrazinyl, halophenanthridinyl, halophenanthrolinyl, halophenazinyl, halophosphanthridinyl, halophosphindolyl, halophosphindolizinyl, halophosphinolizinyl, halophthalazinyl, halopteridinyl, halophthaloperinyl, halopurinyl, halopyranyl, halothiopyranal, halopyrazinyl, halopyrazolyl, halopyridazinyl, halopyridinyl, halopyrindinyl, halopyrimidinyl, halopyrrolyl, halopyrrolizinyl, haloquinazolinyl, haloquindolinyl, halo-1H-quinindolinyl, haloquinolinyl, haloquinolizinyl, haloquinoxalinyl, haloselenophenyl, halothebenidinyl, halothiazolyl, halothiophenyl, halotriphenodioxazinyl, halotriphenodithiazinyl, haloxanthenyl, halochromanyl, halothiochromanyl, haloindolinyl, haloisochromanyl, haloisothiochromanyl, haloisoindolinyl, halobipyridyl, halopyrido[2,1,6-de]quinolizinyl, and the like.

When R′″ a C₂-C₁₀₀ substituted, unsaturated or partially unsaturated, linear or branched alicyclic hydrocarbyl substituent, and R′″ is substituted with at least one halogen substituent selected from chloro, bromo, and iodo, said halogen substituent is bonded to a sp² carbon atom, non-limiting examples of R′″ include all isomers of haloalkenes and all isomers of hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, halogen, or polar group substituted haloalkenes where the halogen radical (halo) is bromo, chloro or iodo and is bonded to an sp² carbon atom of the alkene including: haloethenyl, halopropenyl, halobutenyl, halopentenyl, halohexenyl, haloheptenyl, halooctenyl, halononenyl, halodecenyl, haloundecenyl, halododecenyl, halotridecenyl, halotetradecenyl, halopentadecenyl, halohexadecenyl, haloheptadecenyl, halooctadecenyl, halononadecenyl, haloeicosenyl, haloheneicosenyl, halodocosenyl, halotricosenyl, halotetracosenyl, halopentacosenyl, halohexacosenyl, haloheptacosenyl, halooctacosenyl, halononacosenyl, halotriacontenyl, halobutadienyl, halopentadienyl, halohexadienyl, haloheptadienyl, halooctadienyl, halononadienyl, halodecadienyl, haloundecadienyl, halododecadienyl, halotridecadienyl, halotetradecadienyl, halopentadecadienyl, halohexadecadienyl, haloheptadecadienyl, halooctadecadienyl, halononadecadienyl, haloeicosadienyl, haloheneicosadienyl, halodocosadienyl, halotricosadienyl, halotetracosadienyl, halopentacosadienyl, halohexacosadienyl, haloheptacosadienyl, halooctacosadienyl, halononacosadienyl, halotriacontadienyl, halohexatrienyl, haloheptatrienyl, halooctatrienyl, halononatrienyl, halodecatrienyl, haloundecatrienyl, halododecatrienyl, halotridecatrienyl, halotetradecatrienyl, halopentadecatrienyl, halohexadecatrienyl, haloheptadecatrienyl, halooctadecatrienyl, halononadecatrienyl, haloeicosatrienyl, haloheneicosatrienyl, halodocosatrienyl, halotricosatrienyl, halotetracosatrienyl, halopentacosatrienyl, halohexacosatrienyl, haloheptacosatrienyl, halooctacosatrienyl, halononacosatrienyl, halotriacontatrienyl, halooctatetrenyl, halononatetrenyl, halodecatetrenyl, haloundecatetrenyl, halododecatetrenyl, halotridecatetrenyl, halotetradecatetrenyl, halopentadecatetrenyl, halohexadecatetrenyl, haloheptadecatetrenyl, halooctadecatetrenyl, halononadecatetrenyl, haloeicosatetrenyl, haloheneicosatetrenyl, halodocosatetrenyl, halotricosatetrenyl, halotetracosatetrenyl, halopentacosatetrenyl, halohexacosatetrenyl, haloheptacosatetrenyl, halooctacosatetrenyl, halononacosatetrenyl, halotriacontatetrenyl, halodecapentaenyl, haloundecapentaenyl, halododecapentaenyl, halotridecapentaenyl, halotetradecapentaenyl, halopentadecapentaenyl, halohexadecapentaenyl, haloheptadecapentaenyl, halooctadecapentaenyl, halononadecapentaenyl, haloeicosapentaenyl, haloheneicosapentaenyl, halodocosapentaenyl, halotricosapentaenyl, halotetracosapentaenyl, halopentacosapentaenyl, halohexacosapentaenyl, haloheptacosapentaenyl, halooctacosapentaenyl, halononacosapentaenyl, halotriacontapentaenyl, halododecahexaenyl, halotridecahexaenyl, halotetradecahexaenyl, halopentadecahexaenyl, halohexadecahexaenyl, haloheptadecahexaenyl, halooctadecahexaenyl, halononadecahexaenyl, haloeicosahexaenyl, haloheneicosahexaenyl, halodocosahexaenyl, halotricosahexaenyl, halotetracosahexaenyl, halopentacosahexaenyl, halohexacosahexaenyl, haloheptacosahexaenyl, halooctacosahexaenyl, halononacosahexaenyl, halotriacontahexaenyl, halotetradecaheptaenyl, halopentadecaheptaenyl, halohexadecaheptaenyl, haloheptadecaheptaenyl, halooctadecaheptaenyl, halononadecaheptaenyl, haloeicosaheptaenyl, haloheneicosaheptaenyl, halodocosaheptaenyl, halotricosaheptaenyl, halotetracosaheptaenyl, halopentacosaheptaenyl, halohexacosaheptaenyl, haloheptacosaheptaenyl, halooctacosaheptaenyl, halononacosaheptaenyl, halotriacontaheptaenyl, halohexadecaoctaenyl, haloheptadecaoctaenyl, halooctadecaoctaenyl, halononadecaoctaenyl, haloeicosaoctaenyl, haloheneicosaoctaenyl, halodocosaoctaenyl, halotricosaoctaenyl, halotetracosaoctaenyl, halopentacosaoctaenyl, halohexacosaoctaenyl, haloheptacosaoctaenyl, halooctacosaoctaenyl, halononacosaoctaenyl, halotriacontaoctaenyl, halooctadecanonaenyl, halononadecanonaenyl, haloeicosanonaenyl, haloheneicosanonaenyl, halodocosanonaenyl, halotricosanonaenyl, halotetracosanonaenyl, halopentacosanonaenyl, halohexacosanonaenyl, haloheptacosanonaenyl, halooctacosanonaenyl, halononacosanonaenyl, halotriacontanonaenyl, haloeicosadecaenyl, haloheneicosadecaenyl, halodocosadecaenyl, halotricosadecaenyl, halotetracosadecaenyl, halopentacosadecaenyl, halohexacosadecaenyl, haloheptacosadecaenyl, halooctacosadecaenyl, halononacosadecaenyl, halotriacontadecaenyl, halodocosaundecaenyl, halotricosaundecaenyl, halotetracosaundecaenyl, halopentacosaundecaenyl, halohexacosaundecaenyl, haloheptacosaundecaenyl, halooctacosaundecaenyl, halononacosaundecaenyl, halotriacontaundecaenyl, halotetracosadodecaenyl, halopentacosadodecaenyl, halohexacosadodecaenyl, haloheptacosadodecaenyl, halooctacosadodecaenyl, halononacosadodecaenyl, halotriacontadodecaenyl, halohexacosamidecaenyl, haloheptacosamidecaenyl, halooctacosamidecaenyl, halononacosamidecaenyl, halotriacontamidecaenyl, halooctacosatetradecaenyl, halononacosatetradecaenyl, halotriacontatetradecaenyl, halotriacontapentadecaenyl, halocyclopentylidene, halocyclohexylidene, halocycloheptylidene, halocyclooctylidene, halocyclononylidene, halocyclodecylidene, halocycloundecylidene, halocyclododecylidene, and the like.

Preferably, R′″ is a halogen substituted radical of any of the following groups: phenyl, benzyl, phenethyl, and all isomers of methylphenyl, dimethylphenyl, trimethylphenyl, diethylphenyl, dipropylphenyl, dibutylphenyl, and cylcohexenyl. Preferably, R′″ is selected from 2-bromophenyl, 3-bromophenyl, 4-bromophenyl, 2,6-diisopropyl-4-bromophenyl, 2,6-dimethyl-4-bromophenyl, 2,4,6-trimethyl-3-bromophenyl, 2-bromo-4,6-dimethylphenyl, 2-bromo-4-methylphenyl, 2-bromo-3,4,6-trimethylphenyl, 2-bromo-4-fluorophenyl, 2-bromo-4,6-difluorophenyl, 2,6-dibromophenyl, 2,6-dibromo-4-methylphenyl, 2,6-dibromo-4-fluorophenyl, 2,5-dibromophenyl, 2,4-dibromophenyl, 4-chlorophenyl, and 4-iodophenyl.

When present, Y is a bridging group containing boron or a Group 14, 15 or 16 element. Examples of suitable bridging groups include R′₂C, R′₂Si, R′₂Ge, R′₂CCR′₂, R′₂CCR′₂CR′₂, R′₂CCR′₂CR′₂CR′₂, R′C═CR′, R′C═CR′CR′₂, R′₂CCR′═CR′CR′₂, R′C═CR′CR′CR′, R′C═CR′CR′₂CR′₂, R′₂CSiR′₂, R′₂SiSiR′₂, R′₂CSiR′₂CR′₂, R′₂SiCR′₂SiR′₂, R′C═CR′SiR′₂, R′₂CGeR′₂, R′₂GeGeR′₂, R′₂CGeR′₂CR′₂, R′₂GeCR′₂GeR′₂, R′₂SiGeR′₂, R′C═CR′GeR′₂, R′B, R′₂C—BR′, R′₂C—BR′—CR′₂, R′₂C—O—CR′₂, R′₂CR′₂C—O—CR′₂CR′₂, R′₂C—O—CR′₂CR′₂, R′₂C—O—CR′═CR′, R′₂C—S—CR′₂, R′₂CR′₂C—S—CR′₂CR′₂, R′₂C—S—CR′₂CR′₂, R′₂C—S—CR′═CR′, R′₂C—Se—CR′₂, R′₂CR′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′═CR′, R′₂C—N═CR′, R′₂C—NR′—CR′₂, R′₂C—NR′—CR′₂CR′₂, R′₂C—NR′—CR′═CR′, R′₂CR′₂C—NR′—CR′₂CR′₂, R′₂C—P═CR′, and R′₂C—PR′—CR′₂ where R′ is hydrogen or a C₁-C₂₀ containing hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl or germylcarbyl substituent and optionally two or more adjacent R′ may join to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic, cyclic or polycyclic substituent. Preferred examples for the bridging group Y include CH₂, CH₂CH₂, C(CH₃)₂, SiMe₂, SiPh₂, SiMePh, Si(CH₂)₃ and Si(CH₂)₄.

Conveniently, A includes an aromatic five-membered ring pi-bonded to M. Preferably, A is a substituted heterocyclopentadienyl ligand, a substituted heteroindenyl ligand, a substituted heterofluorenyl ligand, or a substituted heterocyclopentanaphthyl ligand.

Preferred examples of the ligand A are substituted and unsubstituted arsacyclopentadienyl ligands, substituted and unsubstituted azaboratabenzene ligands, substituted and unsubstituted azaborindenyl ligands, substituted and unsubstituted azaborollide ligands, substituted and unsubstituted azacyclopentadienyl ligands, substituted and unsubstituted benzothiaborollide ligands, substituted and unsubstituted boratabenzene ligands, substituted and unsubstituted boracyclopentadienyl ligands, substituted and unsubstituted cyclopentathienyl ligands, substituted and unsubstituted cyclopentabenzothienyl ligands, substituted and unsubstituted cyclopentafuryl ligands, substituted and unsubstituted cyclopentapyrrolyl ligands, substituted and unsubstituted cyclopentapyridyl ligands, substituted and unsubstituted cyclopentaphospholyl ligands, substituted and unsubstituted cyclopentaphosphinyl ligands, substituted and unsubstituted cyclopentaindolyl ligands, substituted and unsubstituted cyclopentaquinolyl ligands, substituted and unsubstituted indenodioxolyl ligands, substituted and unsubstituted indenothienyl ligands, substituted and unsubstituted indenopyridyl ligands, substituted and unsubstituted indenophosphinyl ligands, substituted and unsubstituted indenofuryl ligands, substituted and unsubstituted indenobenzothienyl ligands, substituted and unsubstituted indenoindolyl ligands, substituted and unsubstituted oxaborollide ligands, substituted and unsubstituted phosphaboratabenzene ligands, substituted and unsubstituted stibacyclopentadienyl ligands and substituted and unsubstituted thiaborollide ligands.

Preferably, the or each halogen substituent is chloro, bromo, or iodo, and more preferably is chloro or bromo.

Examples of metallocene compounds according to said fifth embodiment include:

-   dimethylsilanediyl(η⁵-5,6-dimethylcyclopenta[b]thienyl)(N-(2,6-dimethyl-4-bromophenylamido))zirconium     dichloride -   dimethylsilanediyl(η⁵-5,6-dimethylcyclopenta[b]thienyl)(N-(2,4-dimethyl-6-bromophenylamido))zirconium     dichloride -   dimethylsilanediyl(η⁵-5,6-dimethylcyclopenta[b]thienyl)(N-(2,6-diisopropyl-4-bromophenylamido))zirconium     dichloride, and     the hafnium and titanium analogs of the examples above.

Halogenated Metallocene Synthesis

The metal complexes of formula (1) and the unbridged metal complexes of formula (2), where y=0, can be prepared through one of two general synthetic procedures. The first method involves a transmetallation reaction between a metal halide (MX_(n)) and a metal salt or non-transition metal derivative of a halo-substituted monocyclic or polycyclic ligand. Preferable metal halides include TiCl₄, TiCl₃, ZrCl₄, ZrBr₄, ZrI₄, HfCl₄, LnCl₃, LnBr₃, LnI₃ (where Ln is Sc, Y, La, or a lanthanide group metal), VCl₃, NbCl₅, TaCl₅, CrCl₃, MoCl₅, WCl₆, and the like, and their monocyclopentadienyl, monoindenyl, and monofluorenyl derivatives, such as CpTiCl₃, Cp*ZrCl₃, (indenyl)ZrCl₃, (fluorenyl)HfCl₃, and the like. Preferable salts (M′J_(p)) of halo-substituted monocyclic or polycyclic ligands include Li, Na, K, Tl, and Mg salts, and the like. Preferable non-transition metal derivatives of halo-substituted monocyclic or polycyclic ligands include Si and Sn derivatives, and the like (Q derivatives). Two general examples of this first synthetic method are shown below, where Z is a heteroatom.

The following representative examples further illustrate this method.

The second general procedure involves metallation of a halo-substituted monocyclic or polycyclic ligand by the respective transition metal derivatives, as shown below.

The following representative examples illustrate this method:

Metal complexes of formula (2) with y=1 and those of formula (3) can also be prepared by two general synthetic procedures. The first procedure involves a transmetallation reaction between a metal halide (MX_(n)) and a metal salt or non-transition metal derivative of the A-Y_(y)-A or A-Y_(y)-E dianion. Preferable metal salts (M′J_(p)) of these dianions include Li, Na, K, Tl, and Mg salts, and the like. Preferable non-transition metal derivatives of these dianions include Si and Sn derivatives, and the like. The general scheme of this first synthetic procedure is shown below.

The following representative example illustrates this method.

The second general procedure involves metallation of the compounds of the following general formula HA-Y_(y)-AH by the respective transition metal derivatives, as shown below.

The following representative example illustrates this method.

There are also two general synthetic methods for the preparation of metal complexes of formulae (4) and (5). The first procedure involves a transmetallation reaction between a metal halide (MX_(n)) and a metal salt of an A-Y_(y)-TR″_(t-1-y) dianion. Preferable metal halides include TiCl₄, TICl₃, ZrCl₄, ZrBr₄, ZrI₄, HfCl₄, LnCl₃, LnBr₃, LnI₃ (where Ln is Sc, Y, La, or lanthanide group metal), VCl₃, NbCl₅, TaCl₅, CrCl₃, MoCl₅, WCl₆, and the like. Preferable metal salts (M′J_(p) salts) of the A-Y_(y)-TR″_(t-1-y) dianions include Li, Na, K, Tl, and Mg salts, and the like. The general scheme of this first synthetic procedure is shown below.

The following representative example illustrates this method.

The second general procedure involves metallation of the compounds of the following general formula HA-Y_(y)-T(H)R″_(t-1-y) by the respective transition metal derivatives, as shown below.

The following representative example illustrates this method.

Activators and Catalyst Activation

The halogenated metallocene compounds of the invention are useful as catalyst precursors and, when activated with conventional activators, such as methyl alumoxane, form active catalysts for the polymerization or oligomerization of olefins. Activators that may be used include alumoxanes such as methyl alumoxane, modified methyl alumoxane, ethyl alumoxane, iso-butyl alumoxane and the like; Lewis acid activators include triphenyl boron, tris-perfluorophenyl boron, tris-perfluorophenyl aluminum and the like; Ionic activators include dimethylanilinium tetrakis perfluorophenyl borate, triphenyl carbonium tetrakis perfluorophenyl borate, dimethylanilinium tetrakis perfluorophenyl aluminate, and the like.

A co-activator is a compound capable of alkylating the transition metal complex, such that when used in combination with an activator, an active catalyst is formed. Co-activators include alumoxanes such as methyl alumoxane, modified alumoxanes such as modified methyl alumoxane, and aluminum alkyls such trimethyl aluminum, tri-isobutyl aluminum, triethyl aluminum, and tri-isopropyl aluminum. Co-activators are typically only used in combination with Lewis acid activators and ionic activators when the pre-catalyst is not a dihydrocarbyl or dihydride complex.

The alumoxane component useful as an activator typically is an oligomeric aluminum compound represented by the general formula (R^(x)—Al—O)_(n), which is a cyclic compound, or R^(x) (R^(x)—Al—O)_(n)AlR^(x) ₂, which is a linear compound. In the general alumoxane formula, Rx is independently a C₁-C₂₀ alkyl radical, for example, methyl, ethyl, propyl, butyl, pentyl, isomers thereof, and the like, and “n” is an integer from 1-50. Most preferably, R^(x) is methyl and “n” is at least 4. Methyl alumoxane and modified methyl alumoxanes are most preferred. For further descriptions see, EP 0 279 586, EP 0 594 218, EP 0 561 476, WO94/10180 and U.S. Pat. Nos. 4,665,208, 4,874,734, 4,908,463, 4,924,018, 4,952,540, 4,968,827, 5,041,584, 5,091,352, 5,103,031, 5,157,137, 5,204,419, 5,206,199, 5,235,081, 5,248,801, 5,329,032, 5,391,793, and 5,416,229.

When an alumoxane or modified alumoxane is used, the catalyst-precursor-to-activator molar ratio is from about 1:3000 to 10:1; alternatively, 1:2000 to 10:1; alternatively 1:1000 to 10:1; alternatively, 1:500 to 1:1; alternatively 1:300 to 1:1; alternatively 1:200 to 1:1; alternatively 1:100 to 1:1; alternatively 1:50 to 1:1; alternatively 1:10 to 1:1. When the activator is an alumoxane (modified or unmodified), some embodiments select the maximum amount of activator at a 5000-fold molar excess over the catalyst precursor (per metal catalytic site). The preferred minimum activator-to-catalyst-precursor ratio is 1:1 molar ratio.

Ionic activators (at times used in combination with a co-activator) may be used in the practice of this invention. Preferably, discrete ionic activators such as [Me₂PhNH][B(C₆F₅)₄], [Ph₃C][B(C₆F₅)₄], [Me₂PhNH][B((C₆H₃-3,5-(CF₃)₂))₄], [Ph₃C][B((C₆H₃-3,5-(CF₃)₂))₄], [NH₄][B(C₆H₅)₄] or Lewis acidic activators such as B(C₆F₅)₃ or B(C₆H₅)₃ can be used. Preferred co-activators, when used, are alumoxanes such as methyl alumoxane, modified alumoxanes such as modified methyl alumoxane, and aluminum alkyls such as tri-isobutyl aluminum, and trimethyl aluminum.

It is within the scope of this invention to use an ionizing or stoichiometric activator, neutral or ionic, such as tri(n-butyl) ammonium tetrakis (pentafluorophenyl) borate, a trisperfluorophenyl boron metalloid precursor or a trisperfluoronaphthyl boron metalloid precursor, polyhalogenated heteroborane anions (WO 98/43983), boric acid (U.S. Pat. No. 5,942,459) or combination thereof.

Examples of neutral stoichiometric activators include tri-substituted boron, tellurium, aluminum, gallium and indium or mixtures thereof. The three substituent groups are each independently selected from alkyls, alkenyls, halogen, substituted alkyls, aryls, arylhalides, alkoxy and halides. Preferably, the three groups are independently selected from halogen, mono or multicyclic (including halosubstituted) aryls, alkyls, and alkenyl compounds and mixtures thereof, preferred are alkenyl groups having 1 to 20 carbon atoms, alkyl groups having 1 to 20 carbon atoms, alkoxy groups having 1 to 20 carbon atoms and aryl groups having 3 to 20 carbon atoms (including substituted aryls). More preferably, the three groups are alkyls having 1 to 4 carbon groups, phenyl, naphthyl or mixtures thereof. Even more preferably, the three groups are halogenated, preferably fluorinated, aryl groups. Most preferably, the neutral stoichiometric activator is trisperfluorophenyl boron or trisperfluoronaphthyl boron.

Ionic stoichiometric activator compounds may contain an active proton, or some other cation associated with, but not coordinated to, or only loosely coordinated to, the remaining ion of the ionizing compound. Such compounds and the like are described in European publications EP-A-0 570 982, EP-A-0 520 732, EP-A-0 495 375, EP-B1-0 500 944, EP-A-0 277 003 and EP-A-0 277 004, and U.S. Pat. Nos. 5,153,157, 5,198,401, 5,066,741, 5,206,197, 5,241,025, 5,384,299 and 5,502,124 and U.S. patent application Ser. No. 08/285,380, filed Aug. 3, 1994, all of which are herein fully incorporated by reference.

Ionic catalysts can be prepared by reacting a transition metal compound with an activator, such as B(C₆F₆)₃, which upon reaction with the hydrolyzable ligand (X′) of the transition metal compound forms an anion, such as ([B(C₆F₅)₃ (X′)]⁻), which stabilizes the cationic transition metal species generated by the reaction. The catalysts can be, and preferably are, prepared with activator components which are ionic compounds or compositions. However preparation of activators utilizing neutral compounds is also contemplated by this invention.

Compounds useful as an activator component in the preparation of the ionic catalyst systems used in the process of this invention comprise a cation, which is preferably a Bronsted acid capable of donating a proton, and a compatible non-coordinating anion which anion is relatively large (bulky), capable of stabilizing the active catalyst species which is formed when the two compounds are combined and said anion will be sufficiently labile to be displaced by olefinic diolefinic and acetylenically unsaturated substrates or other neutral Lewis bases such as ethers, nitriles and the like. Two classes of compatible non-coordinating anions have been disclosed in EPA 277,003 and EPA 277,004 published 1988: 1) anionic coordination complexes comprising a plurality of lipophilic radicals covalently coordinated to and shielding a central charge-bearing metal or metalloid core, and 2) anions comprising a plurality of boron atoms such as carboranes, metallacarboranes and boranes.

In a preferred embodiment, the stoichiometric activators include a cation and an anion component, and may be represented by the following formula:

(L**-H)_(d) ⁺(A_(d) ⁻)

wherein L** is an neutral Lewis base; H is hydrogen; (L**-H)⁺ is a Bronsted acid A^(d−) is a non-coordinating anion having the charge d− d is an integer from 1 to 3.

The cation component, (L**-H)_(d) ⁺ may include Bronsted acids such as protons or protonated Lewis bases or reducible Lewis acids capable of protonating or abstracting a moiety, such as an alkyl or aryl, from the precatalyst after alkylation.

The activating cation (L**-H)_(d) ⁺ may be a Bronsted acid, capable of donating a proton to the alkylated transition metal catalytic precursor resulting in a transition metal cation, including ammoniums, oxoniums, phosphoniums, silyliums, and mixtures thereof, preferably ammoniums of methylamine, aniline, dimethylamine, diethylamine, N-methylaniline, diphenylamine, trimethylamine, triethylamine, N,N-dimethylaniline, methyldiphenylamine, pyridine, p-bromo N,N-dimethylaniline, p-nitro-N,N-dimethylaniline, phosphoniums from triethylphosphine, triphenylphosphine, and diphenylphosphine, oxomiuns from ethers such as dimethyl ether, diethyl ether, tetrahydrofuran and dioxane, sulfoniums from thioethers, such as diethyl thioethers and tetrahydrothiophene, and mixtures thereof. The activating cation (L**-H)_(d) ⁺ may also be a moiety such as silver, tropylium, carbeniums, ferroceniums and mixtures, preferably carboniums and ferroceniums; most preferably triphenyl carbonium.

The anion component A^(d−) include those having the formula [M^(k+)Q_(n)]^(d−) wherein k is an integer from 1 to 3; n is an integer from 2-6; n−k=d;

M is an element selected from Group 13 of the Periodic Table of the Elements, preferably boron or aluminum, and Q is independently a hydride, bridged or unbridged dialkylamido, halide, alkoxide, aryloxide, hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, and halosubstituted-hydrocarbyl radicals, said Q having up to 20 carbon atoms with the proviso that in not more than one occurrence is Q a halide. Preferably, each Q is a fluorinated hydrocarbyl group having 1 to 20 carbon atoms, more preferably each Q is a fluorinated aryl group, and most preferably each Q is a pentafluoryl aryl group. Examples of suitable A^(d−) also include diboron compounds as disclosed in U.S. Pat. No. 5,447,895, which is fully incorporated herein by reference.

Illustrative, but not limiting examples of boron compounds which may be used as an activating cocatalyst in combination with a co-activator in the preparation of the improved catalysts of this invention are tri-substituted ammonium salts such as:

-   trimethylammonium tetraphenylborate, -   triethylammonium tetraphenylborate, -   tripropylammonium tetraphenylborate, -   tri(n-butyl)ammonium tetraphenylborate, -   tri(tert-butyl)ammonium tetraphenylborate, -   N,N-dimethylanilinium tetraphenylborate, -   N,N-diethylanilinium tetraphenylborate, -   N,N-dimethyl-(2,4,6-trimethylanilinium)tetraphenylborate, -   trimethylammonium tetrakis(pentafluorophenyl)borate, -   triethylammonium tetrakis(pentafluorophenyl)borate, -   tripropylammonium tetrakis(pentafluorophenyl)borate, -   tri(n-butyl)ammonium tetrakis(pentafluorophenyl)borate, -   tri(sec-butyl)ammonium tetrakis(pentafluorophenyl)borate, -   N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate, -   N,N-diethylanilinium tetrakis(pentafluorophenyl)borate, -   N,N-dimethyl-(2,4,6-trimethylanilinium)     tetrakis(pentafluorophenyl)borate, -   trimethylammonium tetrakis-(2,3,4,6-tetrafluorophenyl) borate, -   triethylammonium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, -   tripropylammonium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, -   tri(n-butyl)ammonium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, -   dimethyl(tert-butyl)ammonium     tetrakis-(2,3,4,6-tetrafluorophenyl)borate, -   N,N-dimethylanilinium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, -   N,N-diethylanilinium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, -   N,N-dimethyl-(2,4,6-trimethylanilinium)tetrakis-(2,3,4,6-tetrafluorophenyl)borate, -   trimethylammonium tetrakis(perfluoronaphthyl)borate, -   triethylammonium tetrakis(perfluoronaphthyl)borate, -   tripropylammonium tetrakis(perfluoronaphthyl)borate, -   tri(n-butyl)ammonium tetrakis(perfluoronaphthyl)borate, -   tri(tert-butyl)ammonium tetrakis(perfluoronaphthyl)borate, -   N,N-dimethylanilinium tetrakis(perfluoronaphthyl)borate, -   N,N-diethylanilinium tetrakis(perfluoronaphthyl)borate, -   N,N-dimethyl-(2,4,6-trimethylanilinium)     tetrakis(perfluoronaphthyl)borate, -   trimethylammonium tetrakis(perfluorobiphenyl)borate, -   triethylammonium tetrakis(perfluorobiphenyl)borate, -   tripropylammonium tetrakis(perfluorobiphenyl)borate, -   tri(n-butyl)ammonium tetrakis(perfluorobiphenyl)borate, -   tri(tert-butyl)ammonium tetrakis(perfluorobiphenyl)borate, -   N,N-dimethylanilinium tetrakis(perfluorobiphenyl)borate, -   N,N-diethylanilinium tetrakis(perfluorobiphenyl)borate, -   N,N-dimethyl-(2,4,6-trimethylanilinium)     tetrakis(perfluorobiphenyl)borate, -   trimethylammonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, -   triethylammonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, -   tripropylammonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, -   tri(n-butyl)ammonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, -   tri(tert-butyl)ammonium     tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, -   N,N-dimethylanilinium     tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, -   N,N-diethylanilinium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, -   N,N-dimethyl-(2,4,6-trimethylanilinium)tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, -   and dialkyl ammonium salts such as: -   di-(iso-propyl)ammonium tetrakis(pentafluorophenyl)borate, and -   dicyclohexylammonium tetrakis(pentafluorophenyl)borate; -   and other salts such as: -   tri(o-tolyl)phosphonium tetrakis(pentafluorophenyl)borate, -   tri(2,6-dimethylphenyl)phosphonium     tetrakis(pentafluorophenyl)borate, -   tropillium tetraphenylborate, -   triphenylcarbenium tetraphenylborate, -   triphenylphosphonium tetraphenylborate, -   triethylsilylium tetraphenylborate, -   benzene(diazonium)tetraphenylborate, -   tropillium tetrakis(pentafluorophenyl)borate, -   triphenylcarbenium tetrakis(pentafluorophenyl)borate, -   triphenylphosphonium tetrakis(pentafluorophenyl)borate, -   triethylsilylium tetrakis(pentafluorophenyl)borate, -   benzene(diazonium) tetrakis(pentafluorophenyl)borate, -   tropillium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, -   triphenylcarbenium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, -   triphenylphosphonium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, -   triethylsilylium tetrakis-(2,3,4,6-tetrafluorophenyl)borate, -   benzene(diazonium) tetrakis-(2,3,4,6-tetrafluorophenyl)borate, -   tropillium tetrakis(perfluoronaphthyl)borate, -   triphenylcarbenium tetrakis(perfluoronaphthyl)borate, -   triphenylphosphonium tetrakis(perfluoronaphthyl)borate, -   triethylsilylium tetrakis(perfluoronaphthyl)borate, -   benzene(diazonium) tetrakis(perfluoronaphthyl)borate, -   tropillium tetrakis(perfluorobiphenyl)borate, -   triphenylcarbenium tetrakis(perfluorobiphenyl)borate, -   triphenylphosphonium tetrakis(perfluorobiphenyl)borate, -   triethylsilylium tetrakis(perfluorobiphenyl)borate, -   benzene(diazonium) tetrakis(perfluorobiphenyl)borate, -   tropillium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, -   triphenylcarbenium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, -   triphenylphosphonium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, -   triethylsilylium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, and -   benzene(diazonium) tetrakis(3,5-bis(trifluoromethyl)phenyl)borate.

Most preferably, the ionic stoichiometric activator (L**-H)_(d) ⁺(A^(d−)) is N,N-dimethylanilinium tetrakis(perfluorophenyl)borate,

-   N,N-dimethylanilinium tetrakis(perfluoronaphthyl)borate, -   N,N-dimethylanilinium tetrakis(perfluorobiphenyl)borate, -   N,N-dimethylanilinium     tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, -   triphenylcarbenium tetrakis(perfluoronaphthyl)borate, -   triphenylcarbenium tetrakis(perfluorobiphenyl)borate, -   triphenylcarbenium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate,     or -   triphenylcarbenium tetra(perfluorophenyl)borate.

In a preferred embodiment, the activator is trispentafluorophenylborane.

Invention catalyst precursors can also be activated with cocatalysts or activators that comprise non-coordinating anions containing metalloid-free cyclopentadienide ions. These are described in U.S. Patent Publication 2002/0058765 A1, published on 16 May 2002, and for the instant invention, require the addition of a co-activator to the catalyst pre-cursor.

The term “non-coordinating anion” (NCA) means an anion that does not coordinate to the catalyst metal cation or that does coordinate to the metal cation, but only weakly. An NCA coordinates weakly enough that a neutral Lewis base, such as an olefinically or acetylenically unsaturated monomer can displace it from the catalyst center. “Compatible” non-coordinating anions are those which are not degraded to neutrality when the initially formed complex decomposes. Further, the anion will not transfer an anionic substituent or fragment to the cation so as to cause it to form a neutral transition metal compound and a neutral by-product from the anion. Non-coordinating anions useful in accordance with this invention are those that are compatible, stabilize the transition metal complex cation in the sense of balancing its ionic charge at +1, yet retain sufficient lability to permit displacement by an ethylenically or acetylenically unsaturated monomer during polymerization. These types of cocatalysts sometimes use scavengers such as but not limited to tri-iso-butyl aluminum, tri-n-octyl aluminum, tri-n-hexyl aluminum, triethylaluminum or trimethylaluminum.

The present process also can employ cocatalyst compounds or activator compounds that are initially neutral Lewis acids but form a cationic metal complex and a noncoordinating anion, or a zwitterionic complex upon reaction with alkylated transition metal compounds. For example, tris(pentafluorophenyl) boron or aluminum acts to abstract a hydrocarbyl ligand to yield a cationic transition metal complex and stabilizing noncoordinating anion, see EP-A-0 427 697 and EP-A-0 520 732 for illustrations of analogous Group-4 metallocene compounds. Also, see the methods and compounds of EP-A-0 495 375. For formation of zwitterionic complexes using analogous Group 4 compounds, see U.S. Pat. Nos. 5,624,878; 5,486,632; and 5,527,929.

Additional neutral Lewis-acids are known in the art and are suitable for abstracting formal anionic ligands. See in particular the review article by E. Y.-X. Chen and T. J. Marks, “Cocatalysts for Metal-Catalyzed Olefin Polymerization: Activators, Activation Processes, and Structure-Activity Relationships”, Chem. Rev., 100, 1391-1434 (2000).

When the cations of noncoordinating anion precursors are Bronsted acids such as protons or protonated Lewis bases (excluding water), or reducible Lewis acids such as ferrocenium or silver cations, or alkali or alkaline earth metal cations such as those of sodium, magnesium or lithium, the catalyst-precursor-to-activator molar ratio may be any ratio. Combinations of the described activator compounds may also be used for activation.

When an ionic or neutral stoichiometric activator is used, the catalyst-precursor-to-activator molar ratio is from 1:10 to 1:1; 1:10 to 10:1; 1:10 to 2:1; 1:10 to 3:1; 1:10 to 5:1; 1:2 to 1.2:1; 1:2 to 10:1; 1:2 to 2:1; 1:2 to 3:1; 1:2 to 5:1; 1:3 to 1.2:1; 1:3 to 10:1; 1:3 to 2:1; 1:3 to 3:1; 1:3 to 5:1; 1:5 to 1:1; 1:5 to 10:1; 1:5 to 2:1; 1:5 to 3:1; 1:5 to 5:1; 1:1 to 1:1.2. The catalyst-precursor-to-co-activator molar ratio is from 1:100 to 100:1; 1:75 to 75:1; 1:50 to 50:1; 1:25 to 25:1; 1:15 to 15:1; 1:10 to 10:1; 1:5 to 5:1, 1:2 to 2:1; 1:100 to 1:1; 1:75 to 1:1; 1:50 to 1:1; 1:25 to 1:1; 1:15 to 1:1; 1:10 to 1:1; 1:5 to 1:1; 1:2 to 1:1; 1:10 to 2:1.

Preferred activators and activator/co-activator combinations include methylalumoxane, modified methylalumoxane, mixtures of methylalumoxane with dimethylanilinium tetrakis(pentafluorophenyl)borate or tris(pentafluorophenyl)boron, and mixtures of trimethyl aluminum with dimethylanilinium tetrakis(pentafluorophenyl)borate or tris(pentafluorophenyl)boron.

In some embodiments, scavenging compounds are used with stoichiometric activators. Typical aluminum or boron alkyl components useful as scavengers are represented by the general formula R^(x)JZ₂ where J is aluminum or boron, R^(x) is as previously defined above, and each Z is independently R^(x) or a different univalent anionic ligand such as halogen (Cl, Br, I), alkoxide (OR^(x)) and the like. Most preferred aluminum alkyls include triethylaluminum, diethylaluminum chloride, tri-iso-butylaluminum, tri-n-octylaluminum, tri-n-hexylaluminum, trimethylaluminum and the like. Preferred boron alkyls include triethylboron. Scavenging compounds may also be alumoxanes and modified alumoxanes including methylalumoxane and modified methylalumoxane.

Mixed Catalysts

The metallocene compounds of the invention can also be used in mixed catalyst systems where, for example, the invention catalyst is used in conjunction with a “second catalyst” in the same reactor or in a series of reactors and where the invention catalyst produces oligomers, macromers, or polymers with olefinic end-groups, and the “second catalyst” incorporates these oligomers, macromers, or polymers into a polymer backbone as a copolymer with other monomers, such as ethylene, propylene, butene, and other C2 to C20 olefins. Alternatively, the invention catalyst can be used in conjunction with a second catalyst in the same reactor or in a series of reactors where the second catalyst produces oligomers, macromers, or polymers with olefinic end-groups, and the invention catalyst incorporates these oligomers, macromers, or polymers into a polymer backbone as a copolymer with other monomers, such as ethylene, propylene, butene, and other C2 to C20 olefins. The “second catalyst” can be of the same family as the invention catalyst, or can be from a completely different catalyst family. Likewise, the invention catalyst can be used in conjunction with a “second catalyst” in the same reactor or in a series of reactors where the invention catalyst and the “second catalyst” produces mixtures or blends of polymers.

Suitable additional olefin polymerization catalysts for use as the “second catalyst” in a mixed catalyst system include any of the compositions well known in the art to catalyze the olefin to polyolefin reaction. For example, the “second catalyst” can include any Group 4-6 metallocene compound, such as the bridged and unbridged compounds containing one or two cyclopentadienyl-containing ligands. Typical catalysts and their precursors are well known in the art. Suitable description appears in the patent literature, for example U.S. Pat. Nos. 4,871,705, 4,937,299, and 5,324,800, EP-A-0418044, EP-A-0591756, WO-A-92/00333 and WO-A-94/01471.

Mixed catalyst systems can also use non-cyclopentadienyl, Group 4 or 5 precursor compounds as the additional olefin polymerization catalyst. Non-cyclopentadienyl, Group 4 or 5 precursor compounds are activable to stable, discrete cationic complexes include those containing bulky, chelating, diamide ligands, such as described in U.S. Pat. No. 5,318,935 and “Conformationally Rigid Diamide Complexes Synthesis and Structure of Tantalum (III) Alkyne Derivatives”, D. H. McConville, et al, Organometallics 1995, 14, 3154-3156. U.S. Pat. No. 5,318,935 describes bridged and unbridged, bis-amido catalyst compounds of Group 4 metals capable of α-olefins polymerization. Bridged bis(arylamido) Group 4 compounds for olefin polymerization are described by D. H. McConville, et al., in Organometallics 1995, 14, 5478-5480. In addition, D. H. McConville, et al, Macromolecules 1996, 29, 5241-5243, describe bridged bis(arylamido) Group 4 compounds that are polymerization catalysts for 1-hexene. Cationic Group-3- or Lanthanide olefin polymerization complexes are disclosed in U.S. Pat. No. 6,403,773.

Mixed catalyst systems can also use transition metal catalyst precursors that have a 2+ oxidation state as the additional olefin polymerization catalyst. Typical Ni²⁺ and Pd²⁺ complexes are diimines, see “New Pd(II)- and Ni(II)-Based Catalysts for Polymerization of Ethylene and α-Olefins”, M. Brookhart, et al, J. Am. Chem. Soc., 1995, 117, 6414-6415, WO 96/23010 and WO 97/02298. See additionally the related bis(imino) Group 8 and 9 organometallic compounds described by V. C. Gibson and others in “Novel olefin polymerization catalysts based on iron and cobalt”, Chem. Commun., 849-850, 1998.

For a review of other potential catalysts used in combination or series with the invention catalysts, see S. D. Ittel and L. K. Johnson, Chem. Rev. 2000, 1000, 1169 and V. C. Gibson and S. K. Spitzmesser, Chem. Rev. 2003, 103, 283.

Supported Catalysts

The catalyst compounds of this invention may be placed on a support. To prepare uniform supported catalysts, the catalyst precursor is preferably dissolved in a suitable solvent and then the resultant solution is applied to or mixed with the support. The term “uniform supported catalyst” means that the catalyst precursor, the activator and or the activated catalyst approach uniform distribution upon the support's accessible surface area, including the interior pore surfaces of porous supports. Some embodiments of supported catalysts prefer uniform supported catalysts; other embodiments show no such preference.

Supported catalyst systems may be prepared by any method effective to support other coordination catalyst systems, effective meaning that the catalyst so prepared can be used for oligomerizing or polymerizing olefin in a heterogenous process. The catalyst precursor, activator, co-activator if needed, suitable solvent, and support may be added in any order or simultaneously.

By one method, the activator, dissolved in an appropriate solvent such as toluene may be stirred with the support material for 1 minute to 10 hours. The total solution volume may be greater than the pore volume of the support, but some embodiments limit the total solution volume below that needed to form a gel or slurry (about 90% to 400%, preferably about 100-200% of the pore volume). The mixture is optionally heated from 30-200° C. during this time. The catalyst precursor may be added to this mixture as a solid, if a suitable solvent is employed in the previous step, or as a solution. Or alternatively, this mixture can be filtered, and the resulting solid mixed with a catalyst precursor solution. Similarly, the mixture may be vacuum dried and mixed with a catalyst precursor solution. The resulting catalyst mixture is then stirred for 1 minute to 10 hours, and the catalyst is either filtered from the solution and vacuum dried or evaporation alone removes the solvent.

Alternatively, the catalyst precursor and activator may be combined in solvent to form a solution. Then the support is added, and the mixture is stirred for 1 minute to 10 hours. The total solution volume may be greater than the pore volume of the support, but some embodiments limit the total solution volume below that needed to form a gel or slurry (about 90% to 400%, preferably about 100-200% of the pore volume). After stirring, the residual solvent is removed under vacuum, typically at ambient temperature and over 10-16 hours. But greater or lesser times and temperatures are possible.

The catalyst precursor may also be supported absent the activator; in that case, the activator (and co-activator if needed) is added to a slurry process liquid phase. For example, a solution of catalyst precursor may be mixed with a support material for a period of about 1 minute to 10 hours. The resulting precatalyst mixture may be filtered from the solution and dried under vacuum, or evaporation alone removes the solvent. The total, catalyst-precursor-solution volume may be greater than the support's pore volume, but some embodiments limit the total solution volume below that needed to form a gel or slurry (about 90% to 400%, preferably about 100 to 200% of the pore volume).

Additionally, two or more different catalyst precursors may be placed on the same support using any of the support methods disclosed above. Likewise, two or more activators or an activator and co-activator may be placed on the same support.

Suitable solid particle supports are typically comprised of polymeric or refractory oxide materials, each being preferably porous. Any support material that has an average particle size greater than 10 m is suitable for use in this invention. Various embodiments select a porous support material, such as for example, talc, inorganic oxides, inorganic chlorides, for example magnesium chloride and resinous support materials such as polystyrene, polyolefin or polymeric compounds or any other organic support material and the like. Some embodiments select inorganic oxide materials as the support material including Group-2, -3, -4, -5, -13, or -14 metal or metalloid oxides. Some embodiments select the catalyst support materials to include silica, alumina, silica-alumina, and their mixtures. Other inorganic oxides may serve either alone or in combination with the silica, alumina, or silica-alumina. These are magnesia, titania, zirconia, and the like. Lewis acidic materials such as montmorillonite and similar clays may also serve as a support. In this case, the support can optionally double as the activator component. But additional activator may also be used.

The support material may be pretreated by any number of methods. For example, inorganic oxides may be calcined, chemically treated with dehydroxylating agents such as aluminum alkyls and the like, or both.

As stated above, polymeric carriers will also be suitable in accordance with the invention, see for example the descriptions in WO 95/15815 and U.S. Pat. No. 5,427,991. The methods disclosed may be used with the catalyst complexes, activators or catalyst systems of this invention to adsorb or absorb them on the polymeric supports, particularly if made up of porous particles, or may be chemically bound through functional groups bound to or in the polymer chains.

The catalyst supports used herein suitably have a surface area of from 10-700 m²/g, a pore volume of 0.1-4.0 cc/g and an average particle size of 10-500 m. Some embodiments select a surface area of 50-500 m²/g, a pore volume of 0.5-3.5 cc/g, or an average particle size of 20-200 m. Other embodiments select a surface area of 100-400 m²/g, a pore volume of 0.8-3.0 cc/g, and an average particle size of 30-100 μm. Catalyst supports typically have a pore size of 10-1000 Angstroms, alternatively 50-500 Angstroms, or 75-350 Angstroms.

The catalyst precursors of the invention are generally deposited on a support at a loading level of 10-100 micromoles of catalyst precursor per gram of solid support; alternately 20-80 micromoles of catalyst precursor per gram of solid support; or 40-60 micromoles of catalyst precursor per gram of support. But greater or lesser values may be used provided that the total amount of solid catalyst precursor does not exceed the support's pore volume.

Monomers

When activated with a conventional activator, the halogenated metallocene compounds of the invention can be used to polymerize or oligomerize any unsaturated monomer or monomers. Preferred monomers include C₂ to C₁₀₀ olefins, preferably C₂ to C₆₀ olefins, preferably C₂ to C₄₀ olefins preferably C₂ to C₂₀ olefins, preferably C₂ to C₁₂ olefins. In some embodiments preferred monomers include linear, branched or cyclic alpha-olefins, preferably C₂ to C₁₀₀ alpha-olefins, preferably C₂ to C₆₀ alpha-olefins, preferably C₂ to C₄₀ alpha-olefins preferably C₂ to C₂₀ alpha-olefins, preferably C₂ to C₁₂ alpha-olefins. Preferred olefin monomers may be one or more of ethylene, propylene, butene, pentene, hexene, heptene, octene, nonene, decene, dodecene, 4-methylpentene-1,3-methylpentene-1,3,5,5-trimethylhexene-1, and 5-ethylnonene-1.

In another embodiment the polymer produced herein is a copolymer of one or more linear or branched C₃ to C₃₀ prochiral alpha-olefins or C₅ to C₃₀ ring containing olefins or combinations thereof capable of being polymerized by either stereospecific and non-stereospecific catalysts. Prochiral, as used herein, refers to monomers that favor the formation of isotactic or syndiotactic polymer when polymerized using stereospecific catalyst(s).

Preferred monomers may also include aromatic-group-containing monomers containing up to 30 carbon atoms. Suitable aromatic-group-containing monomers comprise at least one aromatic structure, preferably from one to three, more preferably a phenyl, indenyl, fluorenyl, or naphthyl moiety. The aromatic-group-containing monomer further comprises at least one polymerizable double bond such that after polymerization, the aromatic structure will be pendant from the polymer backbone. The aromatic-group containing monomer may further be substituted with one or more hydrocarbyl groups including but not limited to C₁ to C₁₀ alkyl groups. Additionally two adjacent substitutions may be joined to form a ring structure. Preferred aromatic-group-containing monomers contain at least one aromatic structure appended to a polymerizable olefinic moiety. Particularly preferred aromatic monomers include styrene, alpha-methylstyrene, para-alkylstyrenes, vinyltoluenes, vinylnaphthalene, allyl benzene, and indene, especially styrene, para-methylstyrene, 4-phenyl-1-butene and allyl benzene.

Non aromatic cyclic group containing monomers can also be polymerized or oligomerized with the catalyst systems of the invention. These monomers can contain up to 30 carbon atoms. Suitable non-aromatic cyclic group containing monomers preferably have at least one polymerizable olefinic group that is either pendant on the cyclic structure or is part of the cyclic structure. The cyclic structure may also be further substituted by one or more hydrocarbyl groups such as, but not limited to, C₁ to C₁₀ alkyl groups. Preferred non-aromatic cyclic group containing monomers include vinylcyclohexane, vinylcyclohexene, cyclopentadiene, cyclopentene, 4-methylcyclopentene, cyclohexene, 4-methylcyclohexene, cyclobutene, vinyladamantane, norbornene, 5-methylnorbornene, 5-ethylnorbornene, 5-propylnorbornene, 5-butylylnorbornene, 5-pentylnorbornene, 5-hexylnorbornene, 5-heptylnorbornene, 5-octylnorbornene, 5-nonylnorbornene, 5-decylnorbornene, 5-phenylnorbornene, vinylnorbornene, ethylidene norbornene, 5,6-dimethylnorbornene, 5,6-dibutylnorbornene and the like.

Preferred diolefin monomers useful in this invention include any hydrocarbon structure, preferably C₄ to C₃₀, having at least two unsaturated bonds, wherein at least one, typically two, of the unsaturated bonds are readily incorporated into a polymer by either a stereospecific or a non-stereospecific catalyst(s). It is further preferred that the diolefin monomers be selected from alpha-omega-diene monomers (i.e. di-vinyl monomers). More preferably, the diolefin monomers are linear di-vinyl monomers, most preferably those containing from 4 to 30 carbon atoms. Examples of preferred dienes include butadiene, pentadiene, hexadiene, heptadiene, octadiene, nonadiene, decadiene, undecadiene, dodecadiene, tridecadiene, tetradecadiene, pentadecadiene, hexadecadiene, heptadecadiene, octadecadiene, nonadecadiene, icosadiene, heneicosadiene, docosadiene, tricosadiene, tetracosadiene, pentacosadiene, hexacosadiene, heptacosadiene, octacosadiene, nonacosadiene, triacontadiene, particularly preferred dienes include 1,6-heptadiene, 1,7-octadiene, 1,8-nonadiene, 1,9-decadiene, 1,10-undecadiene, 1,11-dodecadiene, 1,12-tridecadiene, 1,13-tetradecadiene, and low molecular weight polybutadienes (Mw less than 1000 g/mol). Preferred cyclic dienes include cyclopentadiene, vinylnorbornene, norbornadiene, ethylidene norbornene, divinylbenzene, dicyclopentadiene or higher ring containing diolefins with or without substituents at various ring positions.

Non-limiting examples of preferred polar unsaturated monomers useful in this invention include nitro substituted monomers including 6-nitro-1-hexene; amine substituted monomers including N-methylallylamine, N-allylcyclopentylamine, and N-allyl-hexylamine; ketone substituted monomers including methyl vinyl ketone, ethyl vinyl ketone, and 5-hexen-2-one; aldehyde substituted monomers including acrolein, 2,2-dimethyl-4-pentenal, undecylenic aldehyde, and 2,4-dimethyl-2,6-heptadienal; alcohol substituted monomers including allyl alcohol, 7-octen-1-ol, 7-octene-1,2-diol, 10-undecen-1-ol, 10-undecene-1,2-diol, 2-methyl-3-buten-1-ol; acetal, epoxide and or ether substituted monomers including 4-hex-5-enyl-2,2-dimethyl-[1,3]dioxolane, 2,2-dimethyl-4-non-8-enyl-[1,3]dioxolane, acrolein dimethyl acetal, butadiene monoxide, 1,2-epoxy-7-octene, 1,2-epoxy-9-decene, 1,2-epoxy-5-hexene, 2-methyl-2-vinyloxirane, allyl glycidyl ether, 2,5-dihydrofuran, 2-cyclopenten-1-one ethylene ketal, 11-methoxyundec-1-ene, and 8-methoxyoct-1-ene; sulfur containing monomers including allyl disulfide; acid and ester substituted monomers including acrylic acid, vinylacetic acid, 4-pentenoic acid, 2,2-dimethyl-4-pentenoic acid, 6-heptenoic acid, trans-2,4-pentadienoic acid, 2,6-heptadienoic acid, methyl acrylate, ethyl acrylate, tert-butyl acrylate, n-butyl acrylate, methacrylic acid, methyl methacrylate, ethyl methacrylate, tert-butyl methacrylate, n-butyl methacrylate, hydroxypropyl acrylate, acetic acid oct-7-enyl ester, non-8-enoic acid methyl ester, acetic acid undec-10-enyl ester, dodec-11-enoic acid methyl ester, propionic acid undec-10-enyl ester, dodec-11-enoic acid ethyl ester, and nonylphenoxypolyetheroxy acrylate; siloxy containing monomers including trimethyloct-7-enyloxy silane, and trimethylundec-10-enyloxy silane, polar functionalized norbornene monomers including 5-norbornene-2-carbonitrile, 5-norbornene-2-carboxaldehyde, 5-norbornene-2-carboxylic acid, cis-5-norbornene-endo-2,3-dicarboxylic acid, 5-norbornene-2,2,-dimethanol, cis-5-norbornene-endo-2,3-dicarboxylic anhydride, 5-norbornene-2-endo-3-endo-dimethanol, 5-norbornene-2-endo-3-exo-dimethanol, 5-norbornene-2-methanol, 5-norbornene-2-ol, 5-norbornene-2-yl acetate, 1-[2-(5-norbornene-2-yl)ethyl]-3,5,7,9,11,13,15-heptacyclopentylpentacyclo[9.5.1.1^(3,9).1^(5,15).1^(7,13)]octasiloxane, 2-benzoyl-5-norbornene, 2-acetyl-5-norbornene, 7-syn methoxymethyl-5-norbornen-2-one, 5-norbornen-2-ol, and 5-norbornen-2-yloxy-trimethylsilane, and partially fluorinated monomers including nonafluoro-1-hexene, allyl-1,1,2,2,-tetrafluoroethyl ether, 2,2,3,3-tetrafluoro-non-8-enoic acid ethyl ester, 1,1,2,2-tetrafluoro-2-(1,1,2,2-tetrafluoro-oct-7-enyloxy)-ethanesulfonyl fluoride, acrylic acid 2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-pentadecafluoro-octyl ester, and 1,1,2,2-tetrafluoro-2-(1,1,2,2,3,3,4,4-octafluoro-dec-9-enyloxy)-ethanesulfonyl fluoride.

In an embodiment herein, the process described herein is used to produce an oligomer of any of the monomers listed above. Preferred oligomers include oligomers of any C₂ to C₂₀ olefins, preferably C₂ to C₁₂ alpha-olefins, most preferably oligomers comprising ethylene, propylene and or butene are prepared. A preferred feedstock for the oligomerization process is the alpha-olefin, ethylene. But other alpha-olefins, including but not limited to propylene and 1-butene, may also be used alone or combined with ethylene. Preferred alpha-olefins include any C₂ to C₄₀ alpha-olefin, preferably any C₂ to C₂₀ alpha-olefin, preferably any C₂ to C₁₂ alpha-olefin, preferably ethylene, propylene, and butene, most preferably ethylene. Dienes may be used in the processes described herein, preferably alpha-omega-dienes are used alone or in combination with mono-alpha olefins.

In a preferred embodiment the process described herein may be used to produce homopolymers or copolymers. (For the purposes of this invention and the claims thereto a copolymer may comprise two, three, four or more different monomer units.) Preferred polymers produced herein include homopolymers or copolymers of any of the above monomers. In a preferred embodiment the polymer is a homopolymer of any C₂ to C₁₂ alpha-olefin. Preferably the polymer is a homopolymer of ethylene or a homopolymer of propylene. In another embodiment the polymer is a copolymer comprising ethylene and one or more of any of the monomers listed above. In another embodiment the polymer is a copolymer comprising propylene and one or more of any of the monomers listed above. In another preferred embodiment the homopolymers or copolymers described, additionally comprise one or more diolefin comonomers, preferably one or more C₄ to C₄₀ diolefins.

In another preferred embodiment the polymer produced herein is a copolymer of ethylene and one or more C₃ to C₂₀ linear, branched or cyclic monomers, preferably one or more C₃ to C₁₂ linear, branched or cyclic alpha-olefins. Preferably the polymer produced herein is a copolymer of ethylene and one or more of propylene, butene, pentene, hexene, heptene, octene, nonene, decene, dodecene, 4-methylpentene-1,3-methylpentene-1,3,5,5-trimethylhexene-1, cyclopentene, 4-methylcyclopentene, cyclohexene, and 4-methylcyclohexene.

In another preferred embodiment the polymer produced herein is a copolymer of propylene and one or more C₂ or C₄ to C₂₀ linear, branched or cyclic monomers, preferably one or more C₂ or C₄ to C₁₂ linear, branched or cyclic alpha-olefins. Preferably the polymer produced herein is a copolymer of propylene and one or more of ethylene, butene, pentene, hexene, heptene, octene, nonene, decene, dodecene, 4-methylpentene-1,3-methylpentene-1, and 3,5,5-trimethylhexene-1.

In a preferred embodiment, the polymer produced herein is a homopolymer of norbornene or a copolymer of norbornene and a substituted norbornene, including polar functionalized norbornenes.

In a preferred embodiment the copolymers described herein comprise at least 50 mole % of a first monomer and up to 50 mole % of other monomers.

In another embodiment, the polymer comprises:

-   -   (a) a first monomer present at from 40 to 95 mole %, preferably         50 to 90 mole %, preferably 60 to 80 mole %, and     -   (b) a comonomer present at from 5 to 60 mole %, preferably 10 to         40 mole %, more preferably 20 to 40 mole %, and     -   (c) a termonomer present at from 0 to 10 mole %, more preferably         from 0.5 to 5 mole %, more preferably 1 to 3 mole %.

In a preferred embodiment the first monomer (a) comprises one or more of any C₃ to C₈ linear branched or cyclic alpha-olefins, including propylene, butene, (and all isomers thereof), pentene (and all isomers thereof), hexene (and all isomers thereof), heptene (and all isomers thereof), and octene (and all isomers thereof). Preferred monomers include propylene, 1-butene, 1-hexene, 1-octene, cyclopentene, cyclohexene, cyclooctene, hexadiene, cyclohexadiene and the like.

In a preferred embodiment the comonomer (b) comprises one or more of any C₂ to C₄₀ linear, branched or cyclic alpha-olefins (provided ethylene, if present, is present at 5 mole % or less), including ethylene, propylene, butene, pentene, hexene, heptene, and octene, nonene, decene, undecene, dodecene, hexadecene, butadiene, hexadiene, heptadiene, pentadiene, octadiene, nonadiene, decadiene, dodecadiene, styrene, 3,5,5-trimethylhexene-1,3-methylpentene-1,4-methylpentene-1, cyclopentadiene, and cyclohexene.

In a preferred embodiment the termonomer (c) comprises one or more of any C₂ to C₄₀ linear, branched or cyclic alpha-olefins, (provided ethylene, if present, is present at 5 mole % or less), including ethylene, propylene, butene, pentene, hexene, heptene, and octene, nonene, decene, undecene, dodecene, hexadecene, butadiene, hexadiene, heptadiene, pentadiene, octadiene, nonadiene, decadiene, dodecadiene, styrene, 3,5,5-trimethylhexene-1,3-methylpentene-1,4-methylpentene-1, cyclopentadiene, and cyclohexene.

In a preferred embodiment the monomers described above further comprise one or more dienes at up to 10 weight %, preferably at 0.00001 to 1.0 weight %, preferably 0.002 to 0.5 weight %, even more preferably 0.003 to 0.2 weight %, based upon the total weight of the composition. In some embodiments 500 ppm or less of diene is added to the polymerization, preferably 400 ppm or less, preferably or 300 ppm or less. In other embodiments at least 50 ppm of diene is added to the polymerization, or 100 ppm or more, or 150 ppm or more.

Polymerization Processes

Invention catalyst complexes are useful in polymerizing unsaturated monomers conventionally known to undergo metallocene-catalyzed polymerization such as solution, slurry, gas-phase, and high-pressure polymerization. Typically one or more transition metal compounds, one or more activators, and one or more monomers are contacted to produce polymer. These catalysts may be supported and as such will be particularly useful in the known, fixed-bed, moving-bed, fluid-bed, slurry, solution, or bulk operating modes conducted in single, series, or parallel reactors.

One or more reactors in series or in parallel may be used in the present invention. The transition metal compound, activator and when required, co-activator, may be delivered as a solution or slurry, either separately to the reactor, activated in-line just prior to the reactor, or preactivated and pumped as an activated solution or slurry to the reactor. Polymerizations are carried out in either single reactor operation, in which monomer, comonomers, catalyst/activator/co-activator, optional scavenger, and optional modifiers are added continuously to a single reactor or in series reactor operation, in which the above components are added to each of two or more reactors connected in series. The catalyst components can be added to the first reactor in the series. The catalyst component may also be added to both reactors, with one component being added to first reaction and another component to other reactors. In one preferred embodiment, the precatalyst is activated in the reactor in the presence of olefin.

Ethylene-alpha-olefin (including ethylene-cyclic olefin and ethylene-alpha-olefin-diolefin) elastomers of high molecular weight and low crystallinity can be prepared utilizing the catalysts of the invention under traditional solution processes or by introducing ethylene gas into a slurry utilizing the alpha-olefin or cyclic olefin or mixture thereof with other monomers, polymerizable and not, as a polymerization diluent in which the catalyst suspension is suspended. Typical ethylene pressures will be between 10 and 1000 psig (69-6895 kPa) and the polymerization diluent temperature will typically be between −10 and 160° C. The process can be carried out in a stirred tank reactor or a tubular reactor, or more than one reactor operated in series or in parallel. See the disclosure of U.S. Pat. No. 5,001,205 for general process conditions. All documents are incorporated by reference for description of polymerization processes, ionic activators and useful scavenging compounds.

The invention catalyst compositions can be used individually or can be mixed with other known polymerization catalysts to prepare polymer blends. Monomer and catalyst selection allows polymer blend preparation under conditions analogous to those using individual catalysts. Polymers having increased MWD for improved processing and other traditional benefits available from polymers made with mixed catalyst systems can thus be achieved.

Generally, when using invention catalysts, particularly when they are immobilized on a support, the complete catalyst system will additionally comprise one or more scavenging compounds. Here, the term scavenging compound means a compound that removes polar impurities from the reaction environment. These impurities adversely affect catalyst activity and stability. Typically, purifying steps are usually used before introducing reaction components to a reaction vessel. But such steps will rarely allow polymerization without using some scavenging compounds. Normally, the polymerization process will still use at least small amounts of scavenging compounds.

Typically, the scavenging compound will be an organometallic compound such as the Group 13 organometallic compounds of U.S. Pat. Nos. 5,153,157, 5,241,025 and WO-A-91/09882, WO-A-94/03506, WO-A-93/14132, and that of WO 95/07941. Exemplary compounds include triethyl aluminum, triethyl borane, tri-iso-butyl aluminum, methyl alumoxane, iso-butyl alumoxane, and tri-n-octyl aluminum. Those scavenging compounds having bulky or C₆-C₂₀ linear hydrocarbyl substituents connected to the metal or metalloid center usually minimize adverse interaction with the active catalyst. Examples include triethylaluminum, but more preferably, bulky compounds such as tri-iso-butyl aluminum, tri-iso-phenyl aluminum, and long-chain linear alkyl-substituted aluminum compounds, such as tri-n-hexyl aluminum, tri-n-octyl aluminum, or tri-n-dodecyl aluminum. When alumoxane is used as the activator, any excess over that needed for activation will scavenge impurities and additional scavenging compounds may be unnecessary. Alumoxanes also may be added in scavenging quantities with other activators, e.g., methylalumoxane, [Me₂HNPh]+[B(pfp)₄]- or B(pfp)₃ where perfluorophenyl=pfp=C₆F₅.

In terms of polymer density, the polymers capable of production in accordance the invention, can range from about 0.85 to about 0.95, preferably from 0.87 to 0.93, more preferably 0.89 to 0.920. Polymer molecular weights can range from about 3000 Mn to about 2,000,000 Mn or greater. Molecular weight distributions can range from about 1.1 to about 50.0, with molecular weight distributions from 1.2 to about 5.0 being more typical. Pigments, antioxidants and other additives, as is known in the art, may be added to the polymer.

Gas Phase Polymerization

Generally, in a fluidized gas bed process used for producing polymers, a gaseous stream containing one or more monomers is continuously cycled through a fluidized bed in the presence of a catalyst under reactive conditions. The gaseous stream is withdrawn from the fluidized bed and recycled back into the reactor. Simultaneously, polymer product is withdrawn from the reactor and fresh monomer is added to replace the polymerized monomer. (See for example U.S. Pat. Nos. 4,543,399, 4,588,790, 5,028,670, 5,317,036, 5,352,749, 5,405,922, 5,436,304, 5,453,471, 5,462,999, 5,616,661 and 5,668,228 all of which are fully incorporated herein by reference.).

The reactor pressure in a gas phase process may vary from about psig (69 kPa) to about 500 psig (3448 kPa), preferably from about 100 psig (690 kPa) to about 500 psig (3448 kPa), preferably in the range of from about 200 psig (1379 kPa) to about 400 psig (2759 kPa), more preferably in the range of from about 250 psig (1724 kPa) to about 350 psig (2414 kPa).

The reactor temperature in the gas phase process may vary from about 30° C. to about 120° C., preferably from about 60° C. to about 115° C., more preferably in the range of from about 70° C. to 110° C., and most preferably in the range of from about 70° C. to about 95° C. In another embodiment when high density polyethylene is desired then the reactor temperature is typically between 70 and 105° C.

The productivity of the catalyst or catalyst system in a gas phase system is influenced by the partial pressure of the main monomer. The preferred mole percent of the main monomer, ethylene or propylene, preferably ethylene, is from about 25 to 90 mole percent and the comonomer partial pressure is in the range of from about 138 kPa to about 517 kPa, preferably about 517 kPa to about 2069 kPa, which are typical conditions in a gas phase polymerization process. Also in some systems the presence of comonomer can increase productivity.

In a preferred embodiment, the reactor utilized in the present invention is capable of producing more than 500 lbs of polymer per hour (227 Kg/hr) to about 200,000 lbs/hr (90,900 Kg/hr) or higher, preferably greater than 1000 lbs/hr (455 Kg/hr), more preferably greater than 10,000 lbs/hr (4540 Kg/hr), even more preferably greater than 25,000 lbs/hr (11,300 Kg/hr), still more preferably greater than 35,000 lbs/hr (15,900 Kg/hr), still even more preferably greater than 50,000 lbs/hr (22,700 Kg/hr) and preferably greater than 65,000 lbs/hr (29,000 Kg/hr) to greater than 100,000 lbs/hr (45,500 Kg/hr), and most preferably over 100,000 lbs/hr (45,500 Kg/hr).

Other gas phase processes contemplated by the process of the invention include those described in U.S. Pat. Nos. 5,627,242, 5,665,818 and 5,677,375, and European publications EP-A-0794 200, EP-A-0 802 202 and EP-B-634 421 all of which are herein fully incorporated by reference.

In another preferred embodiment the catalyst system is in liquid form and is introduced into the gas phase reactor into a resin particle lean zone. For information on how to introduce a liquid catalyst system into a fluidized bed polymerization into a particle lean zone, see U.S. Pat. No. 5,693,727, which is incorporated by reference herein.

Slurry Phase Polymerization

A slurry polymerization process generally operates between 1 to about 50 atmosphere pressure range (15 psig to 735 psig, 103 kPa to 5068 kPa) or even greater and temperatures in the range of 0° C. to about 120° C. In a slurry polymerization, a suspension of solid, particulate polymer is formed in a liquid polymerization diluent medium to which monomer and comonomers along with catalyst are added. The suspension including diluent is intermittently or continuously removed from the reactor where the volatile components are separated from the polymer and recycled, optionally after a distillation, to the reactor. The liquid diluent employed in the polymerization medium is typically an alkane having from 3 to 7 carbon atoms, preferably a branched alkane. The medium employed should be liquid under the conditions of polymerization and relatively inert. When a propane medium is used the process should be operated above the reaction diluent critical temperature and pressure. Preferably, a hexane or an isobutane medium is employed.

In one embodiment, a preferred polymerization technique of the invention is referred to as a particle form polymerization, or a slurry process where the temperature is kept below the temperature at which the polymer goes into solution. Such technique is well known in the art, and described in for instance U.S. Pat. No. 3,248,179 which is fully incorporated herein by reference. The preferred temperature in the particle form process is within the range of about 85° C. to about 110° C. Two preferred polymerization methods for the slurry process are those employing a loop reactor and those utilizing a plurality of stirred reactors in series, parallel, or combinations thereof. Non-limiting examples of slurry processes include continuous loop or stirred tank processes. Also, other examples of slurry processes are described in U.S. Pat. No. 4,613,484, which is herein fully incorporated by reference.

In another embodiment, the slurry process is carried out continuously in a loop reactor. The catalyst, as a slurry in isobutane or as a dry free flowing powder, is injected regularly to the reactor loop, which is itself filled with circulating slurry of growing polymer particles in a diluent of isobutane containing monomer and comonomer. Hydrogen, optionally, may be added as a molecular weight control. The reactor is maintained at a pressure of 3620 kPa to 4309 kPa and at a temperature in the range of about 60° C. to about 104° C. depending on the desired polymer melting characteristics. Reaction heat is removed through the loop wall since much of the reactor is in the form of a double-jacketed pipe. The slurry is allowed to exit the reactor at regular intervals or continuously to a heated low pressure flash vessel, rotary dryer and a nitrogen purge column in sequence for removal of the isobutane diluent and all unreacted monomer and comonomers. The resulting hydrocarbon free powder is then compounded for use in various applications.

In another embodiment, the reactor used in the slurry process of the invention is capable of and the process of the invention is producing greater than 2000 lbs of polymer per hour (907 Kg/hr), more preferably greater than 5000 lbs/hr (2268 Kg/hr), and most preferably greater than 10,000 lbs/hr (4540 Kg/hr).

In another embodiment the slurry reactor used in the process of the invention is producing greater than 15,000 lbs of polymer per hour (6804 Kg/hr), preferably greater than 25,000 lbs/hr (11,340 Kg/hr) to about 100,000 lbs/hr (45,500 Kg/hr).

In another embodiment in the slurry process of the invention the total reactor pressure is in the range of from 400 psig (2758 kPa) to 800 psig (5516 kPa), preferably 450 psig (3103 kPa) to about 700 psig (4827 kPa), more preferably 500 psig (3448 kPa) to about 650 psig (4482 kPa), most preferably from about 525 psig (3620 kPa) to 625 psig (4309 kPa).

In yet another embodiment in the slurry process of the invention the concentration of predominant monomer in the reactor liquid medium is in the range of from about 1 to 10 weight percent, preferably from about 2 to about 7 weight percent, more preferably from about 2.5 to about 6 weight percent, most preferably from about 3 to about 6 weight percent.

In a further embodiment the process, preferably a slurry or gas phase process, is operated in the absence of or essentially free of any scavengers, such as triethylaluminum, trimethylaluminum, tri-iso-butylaluminum and tri-n-hexylaluminum and diethyl aluminum chloride, dibutyl zinc and the like. This process is described in International Patent Publication No. WO 96/08520 and U.S. Pat. No. 5,712,352, which are herein fully incorporated by reference.

In another embodiment the process is run with scavengers. Typical scavengers include trimethyl aluminum, tri-iso-butyl aluminum and an excess of alumoxane or modified alumoxane.

In a preferred embodiment, hydrogen or other chain termination agent (such as phenylsilane) is added to the slurry polymerization.

Homogeneous, Bulk or Solution Phase Polymerization

The catalysts described herein can be used advantageously in homogeneous solution processes. Generally this involves polymerization in a continuous reactor in which the polymer formed and the starting monomer and catalyst materials supplied, are agitated to reduce or avoid concentration gradients. Suitable processes operate above the melting point of the polymers at high pressures, from 1 to 3000 bar (10-30,000 MPa), in which the monomer acts as diluent or in solution polymerization using a solvent.

Temperature control in the reactor is obtained by balancing the heat of polymerization and with reactor cooling by reactor jackets or cooling coils to cool the contents of the reactor, auto refrigeration, pre-chilled feeds, vaporization of liquid medium (diluent, monomers or solvent) or combinations of all three. Adiabatic reactors with pre-chilled feeds may also be used. The reactor temperature depends on the catalyst used. In general, the reactor temperature preferably can vary between about 0° C. and about 160° C., more preferably from about 10° C. to about 140° C., and most preferably from about 40° C. to about 120° C. In series operation, the second reactor temperature is preferably higher than the first reactor temperature. In parallel reactor operation, the temperatures of the two reactors are independent. The pressure can vary from about 1 mm Hg to 2500 bar (25,000 MPa), preferably from 0.1 bar to 1600 bar (1-16,000 MPa), most preferably from 1.0 to 500 bar (10-5000 MPa).

Each of these processes may also be employed in single reactor, parallel or series reactor configurations. The liquid processes comprise contacting olefin monomers with the above described catalyst system in a suitable diluent or solvent and allowing said monomers to react for a sufficient time to produce the desired polymers. Hydrocarbon solvents are suitable, both aliphatic and aromatic. Alkanes, such as hexane, pentane, isopentane, and octane, are preferred.

The process can be carried out in a continuous stirred tank reactor, batch reactor, or plug flow reactor, or more than one reactor operated in series or parallel. These reactors may have or may not have internal cooling and the monomer feed may or may not be refrigerated. See the general disclosure of U.S. Pat. No. 5,001,205 for general process conditions. See also, International Patent Publication Nos. WO 96/33227 and WO 97/22639.

Medium and High Pressure Polymerizations

In the high pressure process for the polymerization of ethylene alone or in combination with C₃ to C₁₀ alpha-olefins and optionally other copolymerizable olefins, the temperature of the medium within which the polymerization reaction occurs is at least 120° C. and preferably above 140° C. and may range to 350° C., but below the decomposition temperature of said polymer product, typically from 310° C. to 325° C. Preferably, the polymerization is completed at a temperature within the range of 130° C. to 230° C. The polymerization is completed at a pressure above 200 bar (20 MPa), and generally at a pressure within the range of 500 bar (50 MPa) to 3500 bar (350 MPa). Preferably, the polymerization is completed at a pressure within the range from 800 bar (80 MPa) to 2500 bar (250 MPa).

For a medium pressure process, the temperature within which the polymerization reaction occurs is at least 80° C. and typically ranges from 80° C. to 250° C., preferably from 100° C. to 220° C., and should for a given polymer in the reactor, be above the melting point of said polymer so as to maintain the fluidity of the polymer-rich phase. The pressure can be varied between 100 and 1000 bar for ethylene homopolymers and from 30 bar (3 MPa) to 1000 bar (100 MPa), especially 50 bar (5 MPa) to 500 bar (50 MPa) for processes producing ethylene copolymers containing C₃ to C₁₀ olefins and optionally other copolymerizable olefins.

After polymerization and deactivation of the catalyst, the polymer product can be recovered by processes well known in the art. Any excess reactants may be flashed off from the polymer and the polymer obtained extruded into water and cut into pellets or other suitable comminuted shapes. For general process conditions, see the general disclosure of U.S. Pat. Nos. 5,084,534, 5,408,017, 6,127,497, 6,255,410, which are incorporated herein by reference.

In another embodiment this invention relates to:

1. A metallocene compound represented by the formula (1):

AMX_(n-1)

M is a transition metal atom having a coordination number of n selected from Group 3, 4, 5 or 6 of the Periodic Table of Elements, or a lanthanide metal atom, or actinide metal atom; A is a substituted monocyclic or polycyclic ligand that is pi-bonded to M and is substituted with at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position of the ligand, wherein said ligand also includes one or more ring heteroatoms selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; and the or each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand. 2. The compound of paragraph 1 wherein A is a substituted heterocyclopentadienyl ligand, a substituted heteroindenyl ligand, a substituted heterofluorenyl ligand, or a substituted heterocyclopentanaphthyl ligand. 3. The compound of paragraph 10 or paragraph 2 wherein A is selected from substituted azaboratabenzene ligands, substituted azaborindenyl ligands, substituted azaborollide ligands, substituted benzothiaborollide ligands, substituted boratabenzene ligands, substituted cyclopentathienyl ligands, substituted cyclopentabenzothienyl ligands, substituted cyclopentafuryl ligands, substituted cyclopentapyrrolyl ligands, substituted cyclopentapyridyl ligands, substituted cyclopentaphospholyl ligands, substituted cyclopentaphosphinyl ligands, substituted cyclopentaindolyl ligands, substituted cyclopentaquinolyl ligands, substituted indenodioxolyl ligands, substituted indenothienyl ligands, substituted indenopyridyl ligands, substituted indenophosphinyl ligands, substituted indenofuryl ligands, substituted indenobenzothienyl ligands, substituted indenoindolyl ligands, substituted oxaborollide ligands, substituted phosphaboratabenzene ligands and substituted thiaborollide ligands. 4. A metallocene compound of paragraph 1 and represented by the formula (1)(a):

or the formula (1)(b)

wherein M is a group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; Z is a ring heteroatom selected from boron and a Group 15 atom; G is a divalent C₂ to C₄₀ group which forms a monocyclic or polycyclic ring structure fused to the cyclopentadienyl ring and which contains at least one ring heteroatom selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, and a Group 16 atom; each R is bonded to any bondable ring position of the ring structure ligand in formulas (1)(a) and (1)(b) including the G group, and is, independently, a hydrogen, hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, or heteroatom substituent wherein the heteroatom is selected from boron, Group 15 atoms, or Group 16 atoms, and optionally, two or more adjacent R may join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent; x represents the number of R substituents bonded to the ring structure ligand; the or each X* is bonded to any sp² carbon atom at a bondable ring position in formulae (1)(a) and (1)(b), including the G group, and is a halogen substituent; z represents the number of X* substituents bonded to the ring structure ligand and is at least one; and each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand. 5. A metallocene compound represented by the formula (2):

wherein M is a Group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; each A is, independently, a substituted or unsubstituted monocyclic or polycyclic ligand pi-bonded to M, wherein at least one A includes at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position of the ligand, and wherein each A further includes one or more ring heteroatoms, wherein the or each heteroatom is selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; Y is an optional bridging group that is bonded to each A, and is present when y is one and absent when y is zero; y is zero or one; and each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand; provided that each A is not a substituted or unsubstituted indeno[1,2-b]indolyl ligand. 6. A metallocene compound represented by the formula (3):

wherein M is a Group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; A is a substituted or unsubstituted monocyclic or polycyclic ligand pi-bonded to M, wherein A includes one or more ring heteroatoms selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; E is a substituted or unsubstituted monocyclic or polycyclic arenyl ligand pi-bonded to M at least one of A and E includes at least one halogen substituent directly bonded to an sp² carbon atom at a bondable ring position of the ligand; Y is an optional bridging group that is bonded to E and A, and is present when y is one and absent when y is zero; y is zero or one; and each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand. 7. The compound of paragraph 6 wherein E contains an aromatic five-membered ring pi-bonded to M. 8. The compound of paragraph 6 or paragraph 7 wherein E is a substituted or unsubstituted cyclopentadienyl ligand, a substituted or unsubstituted indenyl ligand, a substituted or unsubstituted fluorenyl ligand, or a substituted or unsubstituted cyclopentanaphthyl ligand. 9. The compound of any one of paragraphs 6 to 8 wherein E includes at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position. 10. The compound of any one of paragraphs 6 to 9 wherein A includes at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position. 11. The compound of any one of paragraphs 5 to 10 wherein Y is present and is a bridging group containing boron or a Group 14, 15 or 16 element. 12. The compound of any one of paragraphs 5 to 11 wherein Y is present and is selected from R′₂C, R′₂Si, R′₂Ge, R′₂CCR′₂, R′₂CCR′₂CR′₂, R′₂CCR′₂CR′₂CR′₂, R′C═CR′, R′C═CR′CR′₂, R′₂CCR′═CR′CR′₂, R′C═CR′CR′═CR′, R′C═CR′CR′₂CR′₂, R′₂CSiR′₂, R′₂SiSiR′₂, R′₂CSiR′₂CR′₂, R′₂SiCR′₂SiR′₂, R′C═CR′SiR′₂, R′₂CGeR′₂, R′₂GeGeR′₂, R′₂CGeR′₂CR′₂, R′₂GeCR′₂GeR′₂, R′₂SiGeR′₂, R′C═CR′GeR′₂, R′B, R′₂C—BR′, R′₂C—BR′—CR′₂, R′N, R′P, O, S, Se, AsR′, SbR′, O—O, S—S, R′N—NR′, R′P—PR′, O—S, O—NR′, O—PR′, S—NR′, S—PR′, R′N—PR′, R′₂C—O—CR′₂, R′₂CR′₂C—O—CR′₂CR′₂, R′₂C—O—CR′₂CR′₂, R′₂C—O—CR′═CR′, R′₂C—S—CR′₂, R′₂CR′₂C—S—CR′₂CR′₂, R′₂C—S—CR′₂CR′₂, R′₂C—S—CR′═CR′, R′₂C—Se—CR′₂, R′₂CR′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′═CR′, R′₂C—N═CR′, R′₂C—NR′—CR′₂, R′₂C—NR′—CR′₂CR′₂, R′₂C—NR′—CR′═CR′, R′₂CR′₂C—NR′—CR′₂CR′₂, R′₂C—P═CR′, and R′₂C—PR′—CR′₂ where R′ is hydrogen or a C₁-C₂₀ containing hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl or germylcarbyl substituent and optionally two or more adjacent R′ may join to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic, cyclic or polycyclic substituent. 13. The compound of any one of paragraphs 5 to 12 wherein Y is present and is selected from CH₂, CH₂CH₂, CH(CH₃)₂, O, S, NPh, PPh, NMe, PMe, SiMe₂, SiPh₂, SiMePh, Si(CH₂)₃ and Si(CH₂)₄, where Me is methyl and Ph is phenyl. 14. A metallocene compound represented by the formula (4):

wherein M is a Group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; A is a substituted monocyclic or polycyclic ligand that is pi-bonded to M and is substituted with at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position of the ligand, wherein A includes one or more ring heteroatoms selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; Y is an optional bridging group that is bonded to A and T, and is present when y is one and absent when y is zero; y is zero or one; and T is a heteroatom with a coordination number of three from Group 15 or with a coordination number of two from Group 16 of the Periodic Table of Elements; R″ is selected from a C₃-C₁₀₀ substituted or unsubstituted monocyclic or polycyclic ring structure substituent that is partially unsaturated, unsaturated or aromatic; or a C₂-C₁₀₀ substituted or unsubstituted, unsaturated or partially unsaturated, linear or branched alicyclic hydrocarbyl substituent; or a C₁-C₁₀₀ substituted or unsubstituted saturated hydrocarbyl radical; t is the coordination number of the heteroatom T where “t-1-y” indicates the number of R″ substituents bonded to T; and each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand. 15. The compound of paragraph 14 wherein R″ is selected from methyl, ethyl, all propyl isomers, all butyl isomers, phenyl, benzyl, phenethyl, 1-adamantyl, cyclododecyl, cyclohexyl and norbornyl. 16. A metallocene compound represented by the formula (5):

wherein M is a Group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; A is a substituted or unsubstituted monocyclic or polycyclic ligand pi-bonded to M, wherein A includes one or more ring heteroatoms selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; Y is an optional bridging group that is bonded to A and T, and is present when y is one and absent when y is zero; y is zero or one; and T is a heteroatom with a coordination number of three from Group 15 or with a coordination number of two from Group 16 of the Periodic Table of Elements; R′″ is selected from a C₃-C₁₀₀ substituted monocyclic or polycyclic ring structure substituent that is partially unsaturated, unsaturated or aromatic; or a C₂-C₁₀₀ substituted, unsaturated or partially unsaturated, linear or branched alicyclic hydrocarbyl substituent; and R′″ is substituted with at least one halogen substituent bonded to a sp² carbon atom; t is the coordination number of the heteroatom T where “t-1-y” indicates the number of R′″ substituents bonded to T and is at least one; each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand. 17. The compound of paragraph 16 wherein R′″ is a halogen substituted radical of any of the following groups: methyl, ethyl, all propyl isomers, all butyl isomers, phenyl, benzyl, phenethyl, 1-adamantyl, cyclododecyl, cyclohexyl and norbornyl. 18. The compound of any one of paragraphs 14 to 17 wherein t-1-y is equal to one. 19. The compound of any one of paragraphs 14 to 18 wherein T is nitrogen. 20. The compound of any one of paragraphs 14 to 19 wherein Y is present and is a bridging group containing boron or a Group 14, 15 or 16 element. 21. The compound of any one of paragraphs 14 to 20 wherein Y is present and is selected from R′₂C, R′₂Si, R′₂Ge, R′₂CCR′₂, R′₂CCR′₂CR′₂, R′₂CCR′₂CR′₂CR′₂, R′C═CR′, R′C═CR′CR′₂, R′₂CCR′═CR′CR′₂, R′C═CR′CR′═CR′, R′C═CR′CR′₂CR′₂, R′₂CSiR′₂, R′₂SiSiR′₂, R′₂CSiR′₂CR′₂, R′₂SiCR′₂SiR′₂, R′C═CR′SiR′₂, R′₂CGeR′₂, R′₂GeGeR′₂, R′₂CGeR′₂CR′₂, R′₂GeCR′₂GeR′₂, R′₂SiGeR′₂, R′C═CR′GeR′₂, R′B, R′₂C—BR′, R′₂C—BR′—CR′₂, AsR′, SbR′, O—O, S—S, R′N—NR′, R′P—PR′, O—S, O—NR′, O—PR′, S—NR′, S—PR′, R′N—PR′, R′₂C—O—CR′₂, R′₂CR′₂C—O—CR′₂CR′₂, R′₂C—O—CR′₂CR′₂, R′₂C—O—CR′═CR′, R′₂C—S—CR′₂, R′₂CR′₂C—S—CR′₂CR′₂, R′₂C—S—CR′₂CR′₂, R′₂C—S—CR′═CR′, R′₂C—Se—CR′₂, R′₂CR′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′═CR′, R′₂C—N═CR′, R′₂C—NR′—CR′₂, R′₂C—NR′—CR′₂CR′₂, R′₂C—NR′—CR′═CR′, R′₂CR′₂C—NR′—CR′₂CR′₂, R′₂C—P═CR′, and R′₂C—PR′—CR′₂ where R′ is hydrogen or a C₁-C₂₀ containing hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl or germylcarbyl substituent and optionally two or more adjacent R′ may join to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic, cyclic or polycyclic substituent. 22. The compound of any one of paragraphs 14 to 21 wherein Y is present and is selected from CH₂, CH₂CH₂, CH(CH₃)₂, NPh, PPh, NMe, PMe, SiMe₂, SiPh₂, SiMePh, Si(CH₂)₃ and Si(CH₂)₄, where Me is methyl and Ph is phenyl. 23. The compound of any one of paragraphs 5 to 22 wherein the or each A contains one aromatic five-membered ring pi-bonded to M. 24. The compound of any one of paragraphs 5 to 23 wherein the or each A ligand is selected from heterocyclopentadienyl ligands, heteroindenyl ligands, heterofluorenyl ligands, and heterocyclopentanaphthyl ligands. 25. The compound of any one of paragraphs 5 to 24 wherein the or each A ligand is selected from azaboratabenzene ligands, azaborindenyl ligands, azaborollide ligands, benzothiaborollide ligands, boratabenzene ligands, cyclopentathienyl ligands, cyclopentabenzothienyl ligands, cyclopentafuryl ligands, cyclopentapyrrolyl ligands, cyclopentapyridyl ligands, cyclopentaphospholyl ligands, cyclopentaphosphinyl ligands, cyclopentaindolyl ligands, cyclopentaquinolyl ligands, indenodioxolyl ligands, indenothienyl ligands, indenopyridyl ligands, indenophosphinyl ligands, indenofuryl ligands, indenobenzothienyl ligands, indenoindolyl ligands, oxaborollide ligands, phosphaboratabenzene ligands and thiaborollide ligands. 26. The compound of any one of paragraphs 1 to 3 and claims 5 to 25 wherein said one or more heteroatoms of A is selected from boron, nitrogen, oxygen, phosphorus, and sulfur. 27. The compound of any preceding paragraphs 1 to 26 wherein M is a Group 4 transition metal atom selected from titanium, zirconium or hafnium. 28. The compound of any preceding paragraph 1 to 27 wherein said at least one halogen substituent is a chloro, bromo or iodo substituent, preferably a chloro or bromo substituent. 29. A metallocene compound selected from:

-   (η⁵-3-bromo-5-methylcyclopenta[b]thienyl)(η⁵-pentamethylcyclopentadienyl)     zirconium dichloride, -   rac-bis(η⁵-3-bromo-5-methylcyclopenta[b]thienyl)zirconium     dichloride, -   meso-bis(η⁵-3-bromo-5-methylcyclopenta[b]thienyl)zirconium     dichloride, -   rac-[dimethylsilanediyl-bis(η⁵-3-bromo-5-methylcyclopenta[b]thien-6-yl)](N¹,N³-diphenyl-1,3-propanediamido)zirconium, -   rac-dimethylsilanediyl-bis(η⁵-3-bromo-5-methylcyclopenta[b]thien-6-yl)     zirconium dichloride, -   rac-[dimethylsilanediyl-bis(η⁵-3-bromo-2,5-dimethylcyclopenta[b]thien-6-yl)](N¹,N³-diphenyl-1,3-propanediamido)zirconium, -   rac-dimethylsilanediylbis(η⁵-3-bromo-2,5-dimethylcyclopenta[b]thien-6-yl)     zirconium dichloride, -   dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,4-dimethyl-6-bromophenylamido))titanium     dichloride, -   dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,6-dimethyl-4-bromophenylamido))titanium     dichloride, -   dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,6-dimethyl-4-bromophenylamido))zirconium     dichloride, -   dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,4-dimethyl-6-bromophenylamido))zirconium     dichloride, -   dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,6-diisopropyl-4-bromophenylamido))titanium     dichloride, -   dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,6-diisopropyl-4-bromophenylamido))zirconium     dichloride, and -   rac-dimethylsilanediylbis(η⁵-3-bromo-4,5-dimethylcyclopenta[b]thien-6-yl)zirconium     dichloride.     30. A catalyst system comprising the metallocene compound of any     preceding paragraph 1 to 29 and an activator.     31. A process for polymerizing olefins comprising contacting the     catalyst system of paragraph 30 with at least one olefin.     32. The process of paragraph 31 wherein said at least one olefin     comprises ethylene and/or propylene.

EXPERIMENTAL Synthesis of Pre-Catalysts

All manipulations with air and moisture sensitive compounds were performed either in an atmosphere of thoroughly purified argon using a standard Schlenk technique or in a controlled atmosphere Glove Box (Vacuum Atmospheres Co.). Tetrahydrofuran (THF, Merck=Merck KGaA, Darmstadt, Germany) and diethyl ether (Merck) for synthesis were purified by distillation over LiAlH₄, and stored over sodium benzophenone ketyl under an inert atmosphere; prior to use, the solvents were distilled from the benzophenone ketyl. Hydrocarbon solvents such as toluene (Merck) and hexanes (Merck) were typically distilled over CaH₂, and were stored over Na/K alloy under an inert atmosphere; prior to use, the solvents were distilled from the Na/K alloy. Methylene chloride (Merck) (and CCl₂D₂ for NMR measurements, Cambridge Isotope Laboratories, Inc.) was distilled and stored over CaH₂ under an inert atmosphere; prior to use, the solvent was distilled from the CaH₂. Chloroform-d (Merck) was distilled over P₄O₁₀ and stored over molecular sieves (3 Å). Methanol (Merck), chloroform (Merck), methyl-tert-butyl ether (Acros=Acros Organics), ZrCl₄(THF)₂ (Aldrich), Cp*ZrCl₃ (Aldrich), “BuLi in hexanes (Chemetall=Chemetall Chemical Products), MeLi in ether (Aldrich), anhydrous K₂CO₃ (Merck), NaBH₄ (Acros), anhydrous powdered AlCl₃ (Merck), P₄O₁₀ (Merck), para-toluene sulfonic acid (Aldrich), bromine (Merck), KOH (Merck), dichlorodimethylsilane (Merck), trichlorosilane (Aldrich), 1.0 M HCl in ether (Aldrich), Silica Gel 60, 40-63 μm (Merck and Fluka), 12 M HCl (Reachim, Moscow, Russia), TiCl₄ (Merck), 2,4-dimethylanilie (Acros), Na₂SO₄ (Akzo Nobel), Na₂CO₃ (Reachim, Moscow, Russia), H₃PO₄ (85%, Reachim, Moscow, Russia), 2-methylthiophene (Merck), methacrylic acid (Acros), thiophene (Acros), tiglic acid (Aldrich), 2,4-dimethylaniline (Acros), 2,6-dimethylaniline (Acros), 2,6-diisopropylaniline (Acros), and glacial acetic acid (Reachim, Moscow, Russia) were used as obtained. Celite 503 (Fluka) was dried in vacuum at 180° C.

5-Methyl-4,5-dihydro-6H-cyclopenta[b]-thiophen-6-one [Ryabov, A. N.; Gribkov, D. V.; Izmer, V. V.; Voskoboynikov, A. Z. Organometallics 2002, 21, 2842], 2-bromo-4,6-dimethylaniline (Kajigaeshi, S.; Kakinami, T.; Inoue, K.; Kondo, M.; Nakamura, H.; Fujikawa, M.; Okamoto, T. Bull. Chem. Soc. Jap. 1988, 61, 597), 4-bromo-2,6-dimethylaniline and 4-bromo-2,6-diisopropylaniline (Giumanini, A. G.; Verardo, G.; Poiana, M.; J. Prakt. Chem. (Leipzig) 1988, 330, 161), and (N¹,N³-diphenyl-1,3-propanediamido)bis(tetrahydrofurano)-zirconium dichloride [Zhang, X.; Zhu, Q.; Guzei, I. A.; Jordan, R. F. J. Am. Chem. Soc. 2000, 122, 8093.] were prepared according to the published methods.

Analytical and semi-preparative liquid chromatography was performed using Waters Delta 600 HPLC system including 996 Photodiode Array Detector, Nova-Pack C18 or HR Silica (60 A, 6 μm, 3.9 and 19×300 mm) and Symmetry C18 (5 μm, 4.6×250 mm) columns. MPLC (Medium Pressure Liquid Chromatography, pressure 5-15 bars) was performed using MPLC glass columns and fittings (Ace Glass), PD5130 pump drive equipped with J1 gear-well pump head (Heidolph), 996 Photodiode Array Detector and Fraction Collector II (Waters Corp.). ¹H and ¹³C spectra were recorded with a Brucker DPX-300 for 1-10% solutions in deuterated solvents. Chemical shifts for ¹H and ¹³C were measured relatively to tetramethylsilane (TMS). In ¹H NMR spectra, the assignment was made on the evidence of double resonance and Nuclear Overhauser Effect (NOE) experiments. C, H microanalyses were done using CHN—O-Rapid analyzer (Heraecus Ltd., Banau, Germany).

Example 1 Synthesis of (η⁵-3-Bromo-5-methylcyclopenta[b]thienyl)(η⁵-pentamethylcyclopentadienyl)zirconium dichloride (1) 3-Bromo-5-methyl-4,5-dihydro-6H-cyclopenta[b]thiophen-6-one

A total of 129 g (0.85 mol) of 5-methyl-4,5-dihydro-6H-cyclopenta[b]thiophen-6-one in 130 ml of CHCl₃ were added to a suspension of 250 g (1.89 mol) of AlCl₃ (anhydrous powder) in 350 ml of CHCl₃ at 0° C. over 0.5 h. The reaction mixture was stirred for 10 min at this temperature; then a solution of 46.7 ml of Br₂ (0.91 mol) in 90 ml of CHCl₃ was added dropwise for 1 h. The resulting mixture was stirred for 1 h at room temperature and, then, poured over 2000 cm³ of ice. The organic layer was separated. The aqueous layer was extracted with 4×200 ml of CH₂Cl₂. The combined organic fractions were washed with 1000 ml of the saturated aqueous Na₂CO₃, dried over K₂CO₃, passed through a short Silica Gel 60 column (40-63 μm, d 40 mm, 1 50 mm), and evaporated to dryness. Fractional distillation gave white crystalline product, b.p. 128° C./0.8 mm Hg. Yield 185 g (94%).

Anal. calc. for C₈H₇BrOS: C, 41.58; H, 3.05. Found: C, 41.78; H, 3.16.

¹H NMR (CDCl₃): δ 7.77 (s, 1H, 2-H), 3.15 (dd, J=17.2 Hz, J=7.0 Hz, 1H, 4-H), 3.04 (m, 1H, 5-H), 2.50 (dd, J=17.2 Hz, J=2.9 Hz, 1H, 4′-H), 1.34 (d, J=7.5 Hz, 3H, 5-Me).

¹³C NMR (CDCl₃): δ 199.3, 165.6, 140.2, 136.7, 108.4, 47.4, 32.3, 16.7.

3-Bromo-5-methyl-4H-cyclopenta[b]thiophene

A total of 1.30 g (34.4 mmol) of NaBH₄ were added to a solution of 5.0 g (21.5 mmol) of the resulting 3-bromo-5-methyl-4,5-dihydro-6H-cyclopenta[b]thiophen-6-one in 60 ml of THF-methanol (2:1, vol.) over 1 h at −5° C. (Caution: temperature must be lower 0° C.). The mixture was stirred for 10 h at ambient temperature, then diluted with 20 ml of water, and acidified with 10% HCl to pH=1. The crude product was extracted with 3×100 ml of CH₂Cl₂. The combined extracts were washed with the saturated aqueous Na₂CO₃, dried over K₂CO₃, and evaporated to dryness. To the yellow oil obtained, 150 ml of toluene were added. This toluene solution was treated with a catalytic amount of ^(p)TolSO₃H (ca. 0.2 g) for 10 min at reflux, cooled to room temperature, and, then, passed through a short Silica Gel 60 column (40-63 μm, d 20 mm, 1 50 mm). This column was additionally eluted with 300 ml of hexanes-methyl-tert-butyl ether mixture (10:1, vol.). The chromatographed product was evaporated to dryness. This procedure gave 4.61 g (99%) of beige crystalline product of 3-bromo-5-methyl-4H-cyclopenta[b]thiophene (containing 3-5% of 3-bromo-5-methyl-6H-cyclopenta[b]thiophene).

Anal. calc. for C₈H₇BrS: C, 44.67; H, 3.28. Found: C, 44.80; H, 3.34.

¹H NMR (CDCl₃): δ 6.94 (s, 1H, 2-H), 6.43 (m, 1H, 6-H), 3.10 (d, J=1.3 Hz, 2H, CH₂), 2.16 (d, J=1.5 Hz, 3H, Me).

¹³C NMR (CDCl₃): δ 129.0, 127.6, 127.5, 122.6, 120.2, 106.5, 40.0, 17.4.

(η⁵-3-Bromo-5-methylcyclopenta[b]thienyl)(η⁵-pentamethylcyclopentadienyl)zirconium dichloride (1)

In the Glove Box, 6.3 ml of 1.84 M MeLi (11.6 mmol) in ether were added to a solution of 2.50 g (11.6 mmol) of 3-bromo-5-methyl-4H-cyclopenta[b]thiophene in 120 ml of diethyl ether at −45° C. This mixture was stirred for 2 h at room temperature and, then, added to a suspension of 3.86 g (11.6 mmol) of Cp*ZrCl₃ in 50 ml of ether at −60° C. The mixture was stirred for 12 h at 20° C. Then ether was evaporated in vacuum, and 120 ml of toluene were added. The resulting mixture was stirred for 6 h at 90° C. and, then, filtered through Celite 503. The filtrate obtained was evaporated to ca. 50 ml. Crystals that precipitated at −30° C. were collected, washed with 3×30 ml of hexanes, and dried in vacuum. Yield 1.90 g (32%) of yellow crystalline product, (η⁵-3-bromo-5-methylcyclopenta[b]thienyl)(η⁵-pentamethylcyclopentadienyl)zirconium dichloride.

Anal. calc. for C₁₈H₂₁BrCl₂SZr: C, 42.27; H, 4.14. Found: C, 42.02; H, 4.04.

¹H NMR (CD₂Cl₂): δ 7.14 (s, 1H, 2-H in thioindenyl), 6.27 (d, J=2.1 Hz, 1H, 4-H in thioindenyl), 5.95 (d, J=2.1 Hz, 1H, 6-H in thioindenyl), 2.13 (s, 3H, 5-Me in thioindenyl), 1.97 (s, 15H, CsMes).

¹³C NMR (CD₂Cl₂): δ 133.7, 129.3, 126.6, 121.4, 110.0, 107.3, 106.4, 102.5, 18.0, 13.7.

The molecular structure of the resultant metallocene compound is shown in FIG. 1.

Example 2 Synthesis of mixture of rac- and meso-bis(η⁵-3-bromo-5-methylcyclopenta[b]thienyl)zirconium dichlorides (2) rac- and meso-bis(η⁵-3-bromo-5-methylcyclopenta[b]thienyl)zirconium dichlorides (2)

In the Glove Box, 12.0 ml of 1.88 M MeLi (22.6 mmol) in ether were added to a solution of 4.86 g (22.5 mmol) of 3-bromo-5-methyl-4H-cyclopenta[b]thiophene produced in Example 1 in 225 ml of diethyl ether at 10° C. This mixture was stirred for 2 h at room temperature and, then, added to a suspension of 4.24 g (11.3 mmol) of ZrCl₄.2THF in 50 ml of ether at 0° C. The resulting mixture was stirred for 24 h at ambient temperature and, then, evaporated to dryness. The residue was treated with 100 ml of toluene; the solution obtained filtered through Celite 503. The filtrate was evaporated in vacuum to ca. 50 ml. Crystals that precipitated at −30° C. were collected, washed with 3×30 ml of hexanes, and dried in vacuum. Yield 1.80 g (54%) of a yellow crystalline product comprising an approximate 3 to 2 mixture of rac- and meso-complexes.

Anal. calc. for C₁₆H₁₂Br₂Cl₂S₂Zr: C, 32.55; H, 2.05. Found: C, 32.39; H, 1.96.

¹H NMR (CD₂Cl₂): rac-complex, δ 7.24 (s, 2H, 2,2′-H), 6.28 (d, J=1.7 Hz, 2H, 4,4′-H), 6.15 (d, J=1.7 Hz, 2H, 6,6′-H), 2.12 (s, 6H, 4,4′-Me); meso-complex, δ 7.22 (s, 2H, 2,2′-H), 6.37 (d, J=1.7 Hz, 2H, 4,4′-H), 6.10 (d, J=1.7 Hz, 2H, 6,6′-H), 2.16 (s, 6H, 4,4′-Me).

Example 3 Synthesis of rac-[dimethylsilanediyl-bis(η⁵-3-bromo-5-methylcyclopenta[b]thien-6-yl)](N¹,N³-diphenyl-1,3-propanediamido)zirconium (3) Mixture of rac- and meso-bis(3-bromo-5-methyl-6H-cyclopenta[b]thien-6-yl) (dimethyl)silanes

In an argon atmosphere, 13.9 ml of 1.84 M MeLi (25.6 mmol) in ether were added to a solution of 5.50 g (25.6 mmol) of 3-bromo-5-methyl-4H-cyclopenta[b]thiophene from Example 1 in 250 ml of diethyl ether at −60° C. This mixture was stirred for 1 h at room temperature and, then, cooled to 0° C. To this mixture 1.55 ml (12.8 mmol) of Me₂SiCl₂ were added at this temperature. The resulting mixture was stirred for 12 h at ambient temperature. Then, 50 ml of water were added. The organic layer was separated, dried over K₂CO₃, and evaporated to dryness in vacuum. The crude product was purified using MPHPLC on Silica Gel 60 (40-63 μm, d 40 mm, 1 500 mm, eluent hexanes, 25 ml/min). This procedure gave 2.61 g (42%) of a mixture of rac- and meso-bis(3-bromo-5-methyl-6H-cyclopenta[b]thien-6-yl)(dimethyl)silanes of ca. 60% purity (i.e. up to 40% of 4,4′- and 4,6′-substituted isomers).

Anal. calc. for C₁₈H₁₈Br₂S₂Si: C, 44.45; H, 3.73. Found: C, 44.90; H, 3.87.

¹H NMR (CDCl₃): rac-isomer, δ 7.11 (s, 2H, 2,2′-H), 6.52 (m, 2H, 4,4′-H), 3.84 (s, 2H, 6,6′-H), 2.25 (s, 6H, 5,5′-Me), −0.25 (s, 6H, SiMe₂); meso-isomer, δ 7.09 (s, 2H, 2,2′-H), 6.52 (m, 2H, 4,4′-H), 3.76 (s, 2H, 6,6′-H), 2.26 (s, 6H, 5,5′-Me), −0.21 (s, 3H, SiMe), −0.26 (s, 3H, SiMe′).

Rac-[dimethylsilanediyl-bis(η⁵-3-bromo-5-methylcyclopenta[b]thien-6-yl)](N¹,N³-diphenyl-1,3-propanediamido)zirconium (3)

In the Glove Box, 12.5 ml of 1.88 M MeLi (23.5 mmol) in ether were added to a solution of 5.70 g (11.7 mmol) of bis(3-bromo-5-methyl-6H-cyclopenta[b]thien-6-yl)(dimethyl)silane in 500 ml of diethyl ether at 0° C. This mixture was stirred for 3 h at room temperature and, then, cooled to −80° C. To this mixture 6.21 g (11.7 mmol) of (N¹,N³-diphenyl-1,3-propanediamido)bis(tetrahydrofurano)zirconium dichloride were added. The resulting mixture was stirred for 24 h at ambient temperature and, then, evaporated to dryness. To the residue 200 ml of toluene were added. The resulting solution was filtered through Celite 503. The filtrate was evaporated in vacuum to ca. 50 ml. Crystals that precipitated at −30° C. were collected, washed with 3×10 ml of hexanes and dried in vacuum. Yield 2.80 g (30%) of orange crystalline product, rac-[dimethylsilanediyl-bis(η⁵-3-bromo-5-methylcyclopenta[b]thien-6-yl)](N¹,N³-diphenyl-1,3-propanediamido)zirconium.

Anal. calc. for C₃₃H₃₂Br₂N₂S₂SiZr: C, 49.55; H, 4.03. Found: C, 49.89; H, 4.15.

¹H NMR(C₆D₆): δ 7.26 (m, 4H, 3,3′,5,5′-H in N—C₆H₅), 7.02 (m, 2H, 4,4′-H in N—C₆H₅), 6.85 (m, 4H, 2,2′,6,6′-H in N—C₆H₅), 6.50 (s, 2H, 5,5′-H in indenyl), 6.21 (s, 2H, 3,3′-H in indenyl), 3.97 (dt, J=15.0 Hz, J=8.4 Hz, 2H, 1,3-H in propylidene), 3.35 (dt, J=15.0 Hz, J=3.2 Hz, 2H, 1′,3′-H in propylidene), 1.98 (s, 6H, 2,2′-Me in indenyl), 1.44 (m, 2H, 2,2′-H in propylidene), 0.64 (s, 6H, SiMe₂).

¹³C NMR(C₆D₆): δ 161.8, 136.8, 129.8, 128.6, 126.6, 126.5, 125.2, 122.6, 113.4, 104.4, 95.5, 58.6, 21.7, 18.4, −1.2.

Example 4 Synthesis of rac-dimethylsilanediyl-bis(η⁵-3-bromo-5-methylcyclopenta[b]thien-6-yl)zirconium dichloride (4) Rac-dimethylsilyl-bis(η⁵-3-bromo-5-methylcyclopenta[b]thien-6-yl)zirconium dichloride (4)

In the Glove Box, 2.0 ml of HSiCl₃ were added at ambient temperature to a solution of 2.54 g (3.18 mmol) of rac-[dimethylsilyl-bis(3-bromo-5-methylcyclopenta[b]thienyl)](N¹,N³-diphenyl-1,3-propanediamido) zirconium from Example 3 in 15 ml of CH₂Cl₂. This mixture was stirred for 1 h. The precipitate formed was filtered off, washed with 3×10 ml of CH₂Cl₂, and dried in vacuum. Yield 1.88 g (91%) of a yellow solid, rac-dimethylsilanediyl-bis(η⁵-3-bromo-5-methylcyclopenta[b]thien-6-yl) zirconium dichloride:

Example 5 Synthesis of rac-[dimethylsilanediyl-bis(η⁵-3-bromo-2,5-dimethylcyclopenta[b]thien-6-yl)](N¹,N³-diphenyl-1,3-propanediamido)zirconium (5) 2,5-Dimethyl-4,5-dihydro-cyclopenta[b]thiophen-6-one

To polyphosphoric acid (prepared from 850 g of P₄O₁₀ and 590 g of 85% H₃PO₄), a mixture of 100 ml g (98.2 g, 1.00 mol) of 2-methylthiophene and 84.1 ml (85.2 g, 0.99 mol) of methacrylic acid in 150 ml CH₂Cl₂ at 60° C. was added. This mixture was stirred at this temperature for 1.5 hours, and then immersed in 1.5 kg of ice. The product was extracted with 5×400 ml of methyl-tert-butyl ether. The combined extracts were washed with saturated aqueous solution of Na₂CO₃ and water, dried over K₂CO₃, and evaporated to dryness. Fractional distillation gave a colorless oil, bp 120° C./3 mm Hg. Yield 51.2 g (31%) of 2,5-dimethyl-4,5-dihydro-cyclopenta[b]thiophen-6-one which was contaminated with ca. 15% of 2,5-dimethyl-5,6-dihydro-cyclopenta[b]thiophen-4-one.

Anal. calc. for C₉H₁₀OS: C, 65.02; H, 6.06. Found: C, 69.94; H, 6.01.

¹H NMR (CDCl₃): δ 6.73 (m, 1H, 3-H), 3.20 (dd, J=17.2 Hz, J=6.9 Hz, 1H, 4-H), 2.92 (m, 1H, 5-H), 2.56 (s, 3H, 2-Me), 2.53 (dd, J=17.2 Hz, J=2.7 Hz, 1H, 4′-H), 1.30 (dd, J=7.5 Hz, J=0.5 Hz, 3H, 5-Me).

¹³C NMR (CDCl₃): δ 199.1, 167.2, 156.9, 137.5, 122.4, 46.1, 32.7, 16.59, 16.56.

3-Bromo-2,5-dimethyl-4,5-dihydro-cyclopenta[b]thiophen-6-one

To a suspension of 92.4 g (693 mmol) of AlCl₃ (anhydrous powder) in 120 ml of CHCl₃, 51.2 g (308 mmol) of 2,5-dimethyl-4,5-dihydro-cyclopenta[b]thiophen-6-one in 50 ml of CHCl₃ was added at 0° C. over 0.5 hour. The reaction mixture was stirred for 10 minutes at this temperature; then a solution of 16.6 ml of Br₂ (323 mmol) in 30 ml of CHCl₃ was added dropwise over 1 hour. The resulting mixture was stirred for 1 hour at room temperature, and then poured over 1000 cm³ of ice. The organic layer was separated. The aqueous layer was extracted with 4×200 ml of CH₂Cl₂. The combined organic fractions were washed with 1000 ml of saturated aqueous Na₂CO₃, dried over K₂CO₃, passed through a short Silica Gel 60 column (40-63 μm, d 40 mm, 1 50 mm), and evaporated to dryness. Fractional distillation gave white crystalline product, b.p. 130° C./0.4 mm Hg. Yield 69.2 g (92%) of the title product contaminated with ca. 12% of 3-bromo-2,5-dimethyl-5,6-dihydro-cyclopenta[b]thiophen-4-one.

Anal. calc. for C₉H₉BrOS: C, 44.10; H, 3.70. Found: C, 43.91; H, 3.62.

¹H NMR (CDCl₃): δ 3.14 (dd, J=17.4 Hz, J=6.9 Hz, 1H, 4-H), 2.96 (m, 1H, 5-H), 2.49 (s, 3H, 2-Me), 2.48 (dd, J=17.4 Hz, J=2.8 Hz, 1H, 4′-H), 1.33 (d, J=7.5 Hz, 3H, 5-Me).

¹³C NMR (CDCl₃): δ 198.6, 166.0, 150.4, 136.0, 107.9, 45.8, 32.6, 16.6, 16.2.

Mixture of 3-bromo-2,5-dimethyl-4H-cyclopenta[b]thiophene and 3-bromo-2,5-dimethyl-6H-cyclopenta[b]thiophene

To a solution of 69.2 g (282 mmol) of 3-bromo-2,5-dimethyl-4,5-dihydro-6H-cyclopenta[b]thiophen-6-one in 840 ml of THF-methanol (2:1, vol.), 17.0 g (451 mmol) of NaBH₄ was added over 1 hour at −5° C. (Caution: temperature must be lower 0° C.). The mixture was stirred for 36 hours at ambient temperature, then diluted with 1500 ml of water, and acidified with 10% HCl to pH=1. The crude product was extracted with 3×100 ml of CH₂Cl₂. The combined extracts were washed with the saturated aqueous Na₂CO₃, dried over K₂CO₃, and evaporated to dryness. To the yellow oil obtained, 1500 ml of toluene were added. This toluene solution was treated with a catalytic amount of ^(p)TolSO₃H (ca. 2 g) for 15 minutes at reflux, cooled to room temperature, and then passed through a short Silica Gel 60 column (40-63 um, d 20 mm, 1 50 mm). This column was additionally eluted with 3×200 ml of hexanes-methyl-tert-butyl ether mixture (10:1, vol.). The chromatographed product was evaporated to dryness. Fractional distillation gave white crystalline product, b.p. 98° C./0.4 mm Hg. Yield 58.5 g (91%).

Anal. calc. for C₉H₉BrS: C, 47.18; H, 3.96. Found: C, 47.03; H, 3.89.

¹H NMR (CDCl₃), 3-bromo-2,5-dimethyl-4H-cyclopenta[b]thiophene: δ 6.32 (hex, J=1.5 Hz, 1H, 6-H), 3.01 (d, J=1.5 Hz, 2H, CH₂), 2.37 (s, 3H, 2-Me), 2.10 (d, J=1.5 Hz, 3H, 5-Me); 3-bromo-2,5-dimethyl-6H-cyclopenta[b]thiophene: δ 6.27 (hex, J=1.5 Hz, 1H, 4-H), 3.19 (m, 2H, CH₂), 2.37 (s, 3H, 2-Me), 2.08 (d, J=1.5 Hz, 3H, 5-Me).

¹³C NMR (CDCl₃), 3-bromo-2,5-dimethyl-4H-cyclopenta[b]thiophene: δ 145.5, 144.8, 140.8, 131.7, 122.1, 105.8, 40.1, 16.8, 15.0; 3-bromo-2,5-dimethyl-6H-cyclopenta[b]thiophene: δ 149.6, 146.6, 135.2 (two resonances), 122.3, 101.8, 41.2, 16.9, 15.1.

Mixture of rac- and meso-bis(3-bromo-2,5-dimethyl-6H-cyclopenta[b]thien-6-yl) (dimethyl)silanes

In an argon atmosphere, to a solution of 10.0 g (43.6 mmol) of a mixture of 3-bromo-2,5-dimethyl-4H-cyclopenta[b]thiophene and 3-bromo-2,5-dimethyl-6H-cyclopenta[b]thiophene in 400 ml of diethyl ether, 23.9 ml of 1.83 M MeLi (43.6 mmol) in ether was added at −25° C. This mixture was stirred for 12 hours at room temperature, and then cooled to 0° C. To this mixture, 2.65 ml (21.8 mmol) of Me₂SiCl₂ were added at this temperature. The resulting mixture was stirred for 48 hours at ambient temperature. Then, 50 ml of water were added. The organic layer was separated, dried over K₂CO₃, and evaporated to dryness in vacuum. The crude product was purified using MPLC on Silica Gel 60 (40-63 um, d 40 mm, length 500 mm, eluent hexanes, 25 ml/min). This procedure gave 6.28 g (56%) the title mixture.

Anal. calc. for C₂₀H₂₂Br₂S₂Si: C, 46.70; H, 4.31. Found: C, 47.05; H, 4.48.

¹H NMR(C₆D₆): rac-isomer, δ 6.48 (m, 1H, 3-H), 3.76 (m, 1H, 1-H), 2.22 (m, 3H, 5-Me), 1.82 (d, J=1.5 Hz, 3H, 2-Me), −0.38 (s, 6H, SiMe₂); meso-isomer, δ 6.49 (m, 1H, 3-H), 3.59 (m, 1H, 1-H), 2.19 (m, 3H, 5-Me), 1.96 (d, J=1.5 Hz, 3H, 2-Me), −0.27 (s, 3H, SiMe), −0.38 (s, 3H, SiMe′).

Rac-[dimethylsilanediyl-bis(η⁵-3-bromo-2,5-dimethylcyclopenta[b]thien-6-yl)](N¹N³-diphenyl-1,3-propanediamido)zirconium (5)

In the Glove Box (nitrogen atmosphere), to a solution of 5.78 g (11.23 mmol) of bis(3-bromo-2,5-dimethyl-6H-cyclopenta[b]thien-6-yl)(dimethyl)silane in 500 ml of diethyl ether, 12.3 ml of 1.83 M MeLi (22.5 mmol) in ether was added at 0° C. This mixture was stirred for 3 hours at room temperature, and then cooled to −80° C. To this mixture, 5.96 g (11.2 mmol) of (N¹,N³-diphenyl-1,3-propanediamido)bis(tetrahydrofurano)zirconium dichloride was added. The resulting mixture was stirred for 24 hours at ambient temperature, and then evaporated to dryness. To the residue, 200 ml of hexane was added. The resulting solution was filtered through Celite 503. The filtrate was evaporated in vacuum to ca. 50 ml. Crystals that precipitated at −30° C. were collected, washed with 2×10 ml of hexanes and dried in vacuum. Yield 2.52 g (27%) of orange crystalline product.

Anal. calc. for C₃₅H₃₆Br₂N₂S₂SiZr: C, 50.77; H, 4.38. Found: C, 51.03; H, 4.50.

¹H NMR (CD₂Cl₂): δ 7.18 (m, 4H, 3,3′,5,5′-H in N—C₆H₅), 6.90 (m, 2H, 4,4′-H in N—C₆H₅), 6.63 (m, 4H, 2,2′,6,6′-H in N—C₆H₅), 5.90 (m, 2H, 3,3′-H in thioindenyl), 3.70 (ddd, J=14.9 Hz, J=8.6 Hz, J=7.9 Hz, 2H, 1,3-H in propylidene), 3.07 (m, 2H, 1′,3′-H in propylidene), 2.32 (s, 6H, 5,5′-Me in thioindenyl), 1.96 (m, 6H, 2,2′-Me in thioindenyl), 1.38 (m, 2H, 2,2′-H in propylidene), 0.88 (s, 6H, SiMe₂).

¹³C NMR (CD₂Cl₂): δ 163.0, 139.6, 139.1, 129.8, 129.6, 125.9, 125.4, 123.2, 113.6, 104.1, 96.3, 59.7, 23.2, 19.5, 17.2, 0.4.

Example 6 Synthesis of rac-dimethylsilanediylbis(η⁵-3-bromo-2,5-dimethylcyclopenta[b]thien-6-yl)zirconium dichloride (6) Rac-dimethylsilanediylbis(s-3-bromo-2,5-dimethylcyclopenta[b]thienyl)zirconium dichloride (6)

In the Glove Box (nitrogen atmosphere), to a solution of 455 mg (0.544 mmol) of rac-1,1′-[dimethylsilyl-bis(4-bromo-2,5-dimethylcyclopenta[b]thienyl)](N¹,N³-diphenyl-1,3-propanediamido)zirconium in 45 ml of diethyl ether-CH₂Cl₂ (1:1, vol.), 1.1 ml of cold 1.0 M solution of HCl in ether was added at −90° C. This mixture was stirred and slowly warmed to ambient temperature over ca. 5 hours. The reaction mixture was evaporated to dryness. The residue was washed with 3×3 ml of CH₂Cl₂ and 3×5 ml of hexanes, and dried in vacuum. Yield 273 mg (74%) of yellow solid.

Anal. calc. for C₂₀H₂₀Br₂Cl₂S₂SiZr: C, 35.61; H, 2.99. Found: C, 35.80; H, 3.07.

¹H NMR (CD₂Cl₂): δ 6.50 (q, J=0.4 Hz, 2H, 3,3′-H), 2.43 (s, 6H, 5,5′-Me), 2.24 (d, J=0.4 Hz, 6H, 2,2′-Me), 0.97 (s, 6H, SiMe₂).

¹³C NMR (CD₂Cl₂): δ 146.3, 145.5, 135.8, 131.1, 126.3, 118.4, 104.5, 20.5, 17.2, 0.5.

Example 7 Synthesis of dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,4-dimethyl-6-bromophenylamido))titanium dichloride (7) 2-Bromo-4,6-dimethylaniline

To a solution of 50.0 g (0.413 mol) of 2,4-dimethylaniline in 1500 cm³ of glacial acetic acid, 21.2 ml (65.6 g, 0.410 mol) of bromine was added dropwise with vigorous stirring over ca. 20 minutes. This mixture was stirred for 2 hours at 40° C. The precipitate that formed was filtered off, washed with 50 ml of acetic acid, and dried in air. The resulting white solid was added to a solution of 100 g of potassium hydroxide in 400 ml of water. This mixture was stirred for minutes. The crude product was extracted with 3×100 ml of dichloromethane. The combined extracts were dried over Na₂SO₄ and evaporated to dryness. Fractional distillation gave yellowish liquid, bp 83-85° C./1 mm Hg. Yield 46.9 g (57%).

Anal. calc. for C₈H₁₀BrN: C, 48.02; H, 5.04. Found: C, 48.15; H, 5.12.

¹H NMR (CDCl₃): δ 7.11 (s, 1H, 3-H), 6.79 (s, 1H, 5-H), 3.88 (br.s, 2H, NH₂), 2.18 (s, 3H, 4-Me), 2.15 (s, 3H, 6-Me).

¹³C NMR (CDCl₃): δ 139.7, 130.3, 130.2, 128.4, 123.4, 110.8, 20.0, 18.3.

4,5-Dimethyl-4,5-dihydro-6H-cyclopenta[b]thiophen-6-one

To polyphosphoric acid (prepared from 500 g of P₄O₁₀ and 340 g of 85% H₃PO₄), a mixture of 47.6 ml (50.0 g, 0.60 mol) of thiophene and 59.5 g (0.60 mol) of tiglic acid in 80 ml of CH₂Cl₂ was added over 2.5 hours at 50° C. This mixture was stirred at this temperature for 2 hours, and then immersed in 1 kg of ice. The product was extracted with 3×300 ml of methyl-tert-butyl ether. The combined extract was washed with a saturated aqueous solution of Na₂CO₃, dried over K₂CO₃, and evaporated to dryness. Fractional distillation gave a colorless oil, bp 96-98° C./2 mm Hg. Yield 89.3 g (90%). On the evidence of NMR spectroscopy, the product was a mixture of two diastereomers (ca. 3:1).

Anal. calc. for C₉H₁₀OS: C, 65.02; H, 6.06. Found: C, 65.13; H, 6.09.

¹H NMR (CDCl₃), major diastereomer: δ 7.89 (d, J=4.8 Hz, 1H, 2-H), 7.04 (d, J=4.8 Hz, 1H, 3-H), 2.90 (m, 1H, 5-H), 2.54 (m, 1H, 4-H), 1.40 (d, J=7.2 Hz, 3H, 4-Me), 1.33 (d, J=7.5 Hz, 3H, 5-Me); minor diastereomer: δ 7.89 (d, J=4.8 Hz, 1H, 2-H), 7.04 (d, J=4.8 Hz, 1H, 3-H), 3.45 (m, 1H, 5-H), 3.12 (m, 1H, 4-H), 1.23 (d, J=7.5 Hz, 6H, 4,5-Me).

Mixture of 4,5-dimethyl-4H-cyclopenta[b]thiophene and 4,5-dimethyl-6H-cyclopenta[b]thiophene

To a solution of 89.3 g (0.54 mol) of 4,5-dimethyl-4,5-dihydro-6H-cyclopenta[b]thiophen-6-one in 750 ml of THF-methanol (2:1, vol.), 28.6 g (0.75 mol) of NaBH₄ was added in small portions while vigorously stirring over 1 hour at 5° C. This mixture was stirred overnight at ambient temperature and then added to ca. 1000 cm³ of cold water. The organic layer was separated; the aqueous layer was extracted with 2×300 ml of methyl-tert-butyl ether. The combined organic fractions were dried over K₂CO₃ and evaporated to dryness. To a hot solution of the residue in 1500 cm³ of toluene, 0.5 g of para-toluenesulfonic acid was added. This mixture was refluxed for 15 minutes, cooled to room temperature and passed through a short Silica Gel 60 column (40-63 μm, d 65 mm, 1 150 mm). The column was additionally washed with hexanes to isolate the product. The obtained solution was evaporated to dryness. Fractional distillation gave colorless oil, bp 56-58° C./3 mm Hg. Yield 60.0 g (74%) of yellowish liquid.

Anal. calc. for C₉H₁₀S: C, 71.95; H, 6.71. Found: C, 72.18; H, 6.80.

¹H NMR (CDCl₃): δ 7.03 (d, J=4.8 Hz, 1H, 2-H), 6.94 (m, 1H, 3-H), 6.35 (m, 1H, 6-H), 3.06 (m, 1H, 4-H), 2.03 (m, 3H, 5-Me), 1.24 (d, J=7.6 Hz, 3H, 4-Me).

Chloro(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)dimethylsilane

Under an argon atmosphere, to a solution of 10.0 g (66.6 mmol) of a mixture of 4,5-dimethyl-4H-cyclopenta[b]thiophene and 4,5-dimethyl-6H-cyclopenta[b]thiophene in 150 ml of THF, 26.6 ml of 2.5 M (66.6 mmol) ^(n)BuLi in hexanes was added dropwise over 30 minutes at −60° C. This mixture was additionally stirred for 2 hours at room temperature and then added dropwise for 3 hours to a solution of 23.7 ml (25.2 g, 200 mmol) of dichlorodimethylsilane in 50 ml of THF. The resulting mixture was stirred for 12 hours at ambient temperature and then evaporated to dryness. Fractional distillation gave yellowish liquid, bp 83-85° C./0.2 mm Hg. Yield 10.7 g (66%).

Anal. calc. for C₁₁H₁₅ClSSi: C, 54.41; H, 6.23. Found: C, 54.60; H, 6.31.

¹H NMR (CDCl₃): δ 7.32 (dd, J=4.9 Hz, J=0.8 Hz, 1H, 3-H in cyclopenta[b]thiophene), 7.05 (d, J=4.9 Hz, 1H, 2-H in cyclopenta[b]thiophene), 3.58 (m, 1H, 6-H in cyclopenta[b]thiophene), 2.23 (m, 3H, 4-Me in cyclopenta[b]thiophene), 2.19 (m, 3H, 5-Me in cyclopenta[b]thiophene), 0.39 (s, 3H, SiMeMe′), 0.29 (s, 3H, SiMeMe′).

¹³C NMR (CDCl₃): δ 152.4, 137.7, 137.6, 130.6, 126.6, 117.5, 48.2, 14.8, 11.6, −0.6, −0.7.

N-(2-Bromo-4,6-dimethylphenyl)(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)dimethylsilanamine

Under an argon atmosphere, to a solution of 14.8 g (74.2 mmol) of 2-bromo-4,6-dimethylaniline in 200 ml of THF, 29.7 ml of 2.5 M (74.2 mmol) ^(n)BuLi in hexanes was added at −80° C. This mixture was warmed for ca. 1 hour to ambient temperature. Then, the resulting solution was added dropwise over ca. 1 hour, while vigorously stirring, to a solution of 18.0 g (74.2 mmol) of chloro(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)dimethylsilane in 100 ml of THF. The resulting mixture was stirred overnight at ambient temperature, and then, evaporated to dryness. To the residue, 150 ml of toluene was added. This mixture was filtered through a glass frit (G4). The filtrate was evaporated to dryness. Fractional distillation gave a yellow liquid, bp 168-172° C./0.2 mm Hg. The product crystallizes slowly at ambient temperature. Yield 16.5 g (55%).

Anal. calc. for C₁₉H₂₄BrNSSi: C, 56.14; H, 5.95. Found: C, 56.28; H, 6.09.

¹H NMR (CDCl₃): δ 7.20 (d, J=4.9 Hz, 1H, 3-H in cyclopenta[b]thiophene), 7.18 (m, 1H, 3-H in phenyl), 6.97 (d, J=4.9 Hz, 1H, 2-H in cyclopenta[b]thiophene), 6.85 (m, 1H, 5-H in phenyl), 3.59 (br.s, 1H, 6-H in cyclopenta[b]thiophene, 2.92 (br.s, 1H, NH), 2.21 (s, 3H, 4-Me in phenyl), 2.19 (s, 3H, 6-Me in phenyl), 2.13 (s, 3H, 4-Me in cyclopenta[b]thiophene), 2.10 (s, 3H, 5-Me in cyclopenta[b]thiophene), 0.14 (s, 3H, SiMeMe′), 0.06 (s, 3H, SiMeMe′).

¹³C NMR (CDCl₃): δ 152.2, 140.7, 140.0, 139.2, 132.6, 132.4, 131.2, 131.1, 130.0, 126.2, 119.9, 118.0, 49.2, 20.8, 20.6, 15.4, 12.1, −1.8, −2.1.

Dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,4-dimethyl-6-bromophenylamido))titanium dichloride (7)

Under an argon atmosphere, to a solution of 3.70 g (9.11 mmol) of N-(2-bromo-4,6-dimethylphenyl)(dimethyl)(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)silanamine in 100 ml of ether, 9.10 ml of 2.0 M (18.2 mmol) MeLi in ether was added dropwise over 10 minutes at room temperature. This resulting mixture was stirred overnight at this temperature. Then, to this mixture a solution of 1.73 g (9.11 mmol) TiCl₄ in 10 ml of pentane was added dropwise, while vigorously stirring, over 30 minutes at 0° C. The resulting mixture was stirred for 24 hours at ambient temperature and then evaporated to dryness. To the residue, 50 ml of toluene was added. The mixture was filtered through a glass frit (G4). The residue on the glass frit was washed with 2×30 ml of toluene. The combined filtrate was evaporated to ca. 50 ml. Crystals that precipitated at −30° C. were collected, washed with 4×50 ml of hexanes, and dried in vacuum. Yield 0.95 g (20%) of red crystalline solid. On the evidence of NMR this material consists of two isomers in ratio equal to ca. 2 to 1.

Anal. calc. for C₁₉H₂₂BrCl₂NSSiTi: C, 43.62; H, 4.24. Found: C, 43.77; H, 4.30.

¹H NMR (CD₂Cl₂), major isomer: δ 7.66 (d, J=5.4 Hz, 1H, 5-H in cyclopenta[b]thienyl), 7.25 (m, 1H, 3-H in phenyl), 7.11 (d, J=5.4 Hz, 1H, 4-H in cyclopenta[b]thienyl), 6.91 (m, 1H, 5-H in phenyl), 2.55 (s, 3H, 4-Me in phenyl), 2.48 (s, 3H, 6-Me in phenyl), 2.20 (s, 3H, 4-Me in cyclopenta[b]thienyl), 1.98 (s, 3H, 5-Me in cyclopenta[b]thienyl), 0.84 (s, 3H, SiMeMe′), 0.74 (s, 3H, SiMeMe′); minor isomer: δ 7.67 (d, J=5.6 Hz, 1H, 5-H in cyclopenta[b]thienyl), 7.20 (m, 1H, 3-H in phenyl), 7.11 (d, J=5.6 Hz, 1H, 4-H in cyclopenta[b]thienyl), 6.94 (m, 1H, 5-H in phenyl), 2.53 (s, 3H, 4-Me in phenyl), 2.40 (s, 3H, 6-Me in phenyl), 2.19 (s, 3H, 4-Me in cyclopenta[b]thienyl), 1.98 (s, 3H, 5-Me in cyclopenta[b]thienyl), 0.89 (s, 3H, SiMeMe′), 0.70 (s, 3H, SiMeMe′).

Example 8 Synthesis of dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,4-dimethyl-6-bromophenylamido))zirconium dichloride (8) 2-Bromo-4,6-dimethylaniline

To a solution of 50.0 g (0.413 mol) of 2,4-dimethylaniline in 1500 cm³ of glacial acetic acid 21.2 ml (65.6 g, 0.410 mol) of bromine was added dropwise while vigorously stirring for ca. 20 min. This mixture was stirred for 2 h at 40° C. The precipitate formed was filtered off, washed with 50 ml of acetic acid, and dried in air. Then, this white solid was added to a solution of 100 g of potassium hydroxide in 400 ml of water. This mixture was stirred for 30 min. The crude product was extracted with 3×100 ml of dichloromethane. The combined extract was dried over Na₂SO₄ and evaporated to dryness. Fractional distillation gave a yellowish liquid, bp 83-85° C./1 mm Hg. Yield 46.9 g (57%).

Anal. calc. for C₈H₁₀BrN: C, 48.02; H, 5.04. Found: C, 48.15; H, 5.12.

¹H NMR (CDCl₃): δ 7.11 (s, 1H, 3-H), 6.79 (s, 1H, 5-H), 3.88 (br.s, 2H, NH₂), 2.18 (s, 3H, 4-Me), 2.15 (s, 3H, 6-Me).

¹³C NMR (CDCl₃): δ 139.7, 130.3, 130.2, 128.4, 123.4, 110.8, 20.0, 18.3.

4,5-Dimethyl-4,5-dihydro-6H-cyclopenta[b]thiophen-6-one

To polyphosphoric acid (prepared from 500 g of P₄O₁₀ and 340 g of 85% H₃PO₄) a mixture of 47.6 ml (50.0 g, 0.60 mol) of thiophene and 59.5 g (0.60 mol) of tiglic acid in 80 ml of CH₂Cl₂ was added over 2.5 h at 50° C. This mixture was stirred at this temperature for 2 h, and, then, immersed in 1 kg of ice. The product was extracted with 3×300 ml of methyl-tert-butyl ether. The combined extract was washed with the saturated aqueous solution of Na₂CO₃, dried over K₂CO₃, and evaporated to dryness. Fractional distillation gave a colorless oil, bp 96-98° C./2 mm Hg. Yield 89.3 g (90%). On the evidence of NMR spectroscopy, the product is a mixture of two diastereomers (ca. 3:1).

Anal. calc. for C₉H₁₀OS: C, 65.02; H, 6.06. Found: C, 65.13; H, 6.09.

¹H NMR (CDCl₃), major diastereomer: δ 7.89 (d, J=4.8 Hz, 1H, 2-H), 7.04 (d, J=4.8 Hz, 1H, 3-H), 2.90 (m, 1H, 5-H), 2.54 (m, 1H, 4-H), 1.40 (d, J=7.2 Hz, 3H, 4-Me), 1.33 (d, J=7.5 Hz, 3H, 5-Me); minor diastereomer: δ 7.89 (d, J=4.8 Hz, 1H, 2-H), 7.04 (d, J=4.8 Hz, 1H, 3-H), 3.45 (m, 1H, 5-H), 3.12 (m, 1H, 4-H), 1.23 (d, J=7.5 Hz, 6H, 4,5-Me).

A mixture of 4,5-dimethyl-4H-cyclopenta[b]thiophene and 4,5-dimethyl-6H-cyclopenta[b]thiophene

To a solution of 89.3 g (0.54 mol) of 4,5-dimethyl-4,5-dihydro-6H-cyclopenta[b]thiophen-6-one in 750 ml of THF-methanol (2:1, vol.) 28.6 g (0.75 mol) of NaBH₄ was added in small portions while vigorously stirring for 1 h at 5° C. This mixture was stirred overnight at ambient temperature and then added to ca. 1000 cm³ of cold water. The organic layer was separated; the aqueous layer was extracted with 2×300 ml of methyl-tert-butyl ether. The combined organic fractions were dried over K₂CO₃ and evaporated to dryness. To a hot solution of the residue in 1500 cm³ of toluene, 0.5 g of para-toluenesulfonic acid was added. This mixture was refluxed for 15 min, cooled to room temperature (using a water bath), and passed through a short Silica Gel 60 column (40-63 μm, d 65 mm, 1 150 mm). The column was additionally washed with hexanes to isolate the product. The obtained solution was evaporated to dryness. Fractional distillation gave a colorless oil, bp 56-58° C./3 mm Hg. Yield 60.0 g (74%) of yellowish liquid.

Anal. calc. for C₉H₁₀S: C, 71.95; H, 6.71. Found: C, 72.18; H, 6.80.

¹H NMR (CDCl₃): δ 7.03 (d, J=4.8 Hz, 1H, 2-H), 6.94 (m, 1H, 3-H), 6.35 (m, 1H, 6-H), 3.06 (m, 1H, 4-H), 2.03 (m, 3H, 5-Me), 1.24 (d, J=7.6 Hz, 3H, 4-Me).

Chloro(4,5-dimethyl-6H-cyclopenta/b thien-6-yl)dimethylsilane

Under an argon atmosphere, to a solution of 10.0 g (66.6 mmol) of a mixture of 4,5-dimethyl-4H-cyclopenta[b]thiophene and 4,5-dimethyl-6H-cyclopenta[b]thiophene in 150 ml of THF, 26.6 ml of 2.5 M (66.6 mmol) ^(n)BuLi in hexanes was added dropwise over 30 min at −60° C. This mixture was additionally stirred for 2 h at room temperature and then added dropwise over 3 h to a solution of 23.7 ml (25.2 g, 200 mmol) of dichlorodimethylsilane in 50 ml of THF. The resulting mixture was stirred for 12 h at ambient temperature and then evaporated to dryness. Fractional distillation gave a yellowish liquid, bp 83-85° C./0.2 mm Hg. Yield 10.7 g (66%).

Anal. calc. for C₁₁H₁₅ClSSi: C, 54.41; H, 6.23. Found: C, 54.60; H, 6.31.

¹H NMR (CDCl₃): δ 7.32 (dd, J=4.9 Hz, J=0.8 Hz, 1H, 3-H in cyclopenta[b]thiophene), 7.05 (d, J=4.9 Hz, 1H, 2-H in cyclopenta[b]thiophene), 3.58 (m, 1H, 6-H in cyclopenta[b]thiophene), 2.23 (m, 3H, 4-Me in cyclopenta[b]thiophene), 2.19 (m, 3H, 5-Me in cyclopenta[b]thiophene), 0.39 (s, 3H, SiMeMe′), 0.29 (s, 3H, SiMeMe′).

¹³C NMR (CDCl₃): δ 152.4, 137.7, 137.6, 130.6, 126.6, 117.5, 48.2, 14.8, 11.6, −0.6, −0.7.

N-(2-Bromo-4,6-dimethylphenyl)(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)dimethylsilanamine

Under and argon atmosphere, to a solution of 14.8 g (74.2 mmol) of 2-bromo-4,6-dimethylaniline in 200 ml of THF, 29.7 ml of 2.5 M (74.2 mmol) ^(n)BuLi in hexanes was added at −80° C. This mixture was warmed for ca. 1 hour to ambient temperature. Then, the resulting solution was added dropwise for ca. 1 hour while vigorously stirring to a solution of 18.0 g (74.2 mmol) of chloro(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)dimethylsilane in 100 ml of THF. The resulting mixture was stirred overnight at ambient temperature, then, evaporated to dryness. To the residue, 150 ml of toluene was added. This mixture was filtered through a glass frit (G4). The filtrate was evaporated to dryness. Fractional distillation gave a yellow liquid, bp 168-172° C./0.2 mm Hg. The product crystallizes slowly at ambient temperature. Yield 16.5 g (55%).

Anal. calc. for C₁₉H₂₄BrNSSi: C, 56.14; H, 5.95. Found: C, 56.28; H, 6.09.

¹H NMR (CDCl₃): δ 7.20 (d, J=4.9 Hz, 1H, 3-H in cyclopenta[b]thiophene), 7.18 (m, 1H, 3-H in phenyl), 6.97 (d, J=4.9 Hz, 1H, 2-H in cyclopenta[b]thiophene), 6.85 (m, 1H, 5-H in phenyl), 3.59 (br.s, 1H, 6-H in cyclopenta[b]thiophene, 2.92 (br.s, 1H, NH), 2.21 (s, 3H, 4-Me in phenyl), 2.19 (s, 3H, 6-Me in phenyl), 2.13 (s, 3H, 4-Me in cyclopenta[b]thiophene), 2.10 (s, 3H, 5-Me in cyclopenta[b]thiophene), 0.14 (s, 3H, SiMeMe′), 0.06 (s, 3H, SiMeMe′).

¹³C NMR (CDCl₃): δ 152.2, 140.7, 140.0, 139.2, 132.6, 132.4, 131.2, 131.1, 130.0, 126.2, 119.9, 118.0, 49.2, 20.8, 20.6, 15.4, 12.1, −1.8, −2.1.

Dimethylsilyl[η⁵-4,5-dimethylcyclopenta[b]thien-6-yl][N-(2-bromo-4,6-dimethylphenyl)amido]zirconium dichloride (8)

In the Glove Box, to a solution of 3.47 g (8.54 mmol) of N-(2-bromo-4,6-dimethylphenyl)(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)dimethylsilanamine in 150 ml of ether, 15.8 ml of 1.08 M (17.1 mmol) MeLi in ether was added dropwise over 10 min at −50° C. This mixture was stirred for 12 h at this temperature. Then, 3.22 g (8.54 mmol) of ZrCl₄ (THF)₂ was added at −80° C., and the resulting mixture was stirred for 24 h. This mixture was evaporated to dryness, and the residue was dissolved in 100 ml of toluene. The solution was filtered through a glass frit (G4), and the filtrate was evaporated to dryness. The residue was washed with 4×50 ml of warm hexanes and recrystallized from 25 ml of toluene. Crystals that precipitated at −30° C. were collected, washed with 2×5 ml of hexanes, and dried in vacuum. Yield 0.55 g (10%) of yellowish crystalline solid. On the evidence of ¹H NMR the product is individual CGC rather than a mixture of isomeric complexes.

Anal. calc. for C_(21.2)H_(26.4)BrCl_(2.5)LiNO_(0.55)SSiZr: C, 40.55; H, 4.21; Zr, 14,54. Found: C, 40.64; H, 4.15; Zr, 14,60.

¹H NMR (CD₂Cl₂): δ 7.53 (d, J=5.5 Hz, 1H, 5-H in cyclopenta[b]thienyl), 7.11 (m, 1H, 3-H in Ph), 6.81 (d, J=5.5 Hz, 1H, 4-H in cyclopenta[b]thienyl), 6.83 (m, 1H, 5-H in Ph), 3.95 (br.s, 2H, OCH₂CH₂ in THF), 2.19 (m, 6H, 4,6-Me in phenyl), 2.17 (s, 3H, 4-Me in cyclopenta[b]thienyl), 1.86 (br.s, 2H, OCH₂CH₂ in THF), 1.58 (s, 3H, 5-Me in cyclopenta[b]thienyl), 0.93 (s, 3H, SiMeMe′), 0.79 (s, 3H, SiMeMe′).

Example 9 Synthesis of dimethylsilanediyl(Q-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,6-dimethyl-4-bromophenylamido))titanium dichloride (9) N-(4-Bromo-2,6-dimethylphenyl)(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)dimethylsilanamine

Under an argon atmosphere, to a solution of 12.4 g (61.9 mmol) of 4-bromo-2,6-dimethylaniline in 300 ml of THF, 16.5 ml of 2.5 M (41.2 mmol) ^(n)BuLi in hexanes was added at −80° C. This mixture was warmed for ca. 2 hour to ambient temperature. Then, the resulting solution was added dropwise over ca. 1 hour, while vigorously stirring, to a solution of 10.0 g (41.2 mmol) of chloro(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)dimethylsilane in 50 ml of THF. The resulting mixture was stirred overnight at ambient temperature, and then, evaporated to dryness. To the residue, 150 ml of toluene was added. This mixture was filtered through a glass frit (G4). The filtrate was evaporated to dryness. Fractional distillation gave a yellow liquid, bp 154-156° C./0.05 mm Hg. The product crystallizes slowly at ambient temperature. Yield 8.36 g (50%).

Anal. calc. for C₁₉H₂₄BrNSSi: C, 56.14; H, 5.95. Found: C, 55.95; H, 5.99.

¹H NMR (CDCl₃): δ 7.20 (d, J=4.9 Hz, 1H, 3-H in cyclopenta[b]thienyl), 7.06 (s, 2H, 3,5-H in phenyl), 6.97 (d, J=4.9 Hz, 1H, 2-H in cyclopenta[b]thienyl), 3.43 (br.s, 1H, 6-H in cyclopenta[b]thienyl), 2.32 (br.s, 1H, NH), 2.12 (br.s, 3H, 5-Me in cyclopenta[b]thienyl), 2.10 (br.s, 3H, 4-Me in cyclopenta[b]thienyl), 2.07 (br.s, 6H, 2,6-Me in phenyl), 0.17 (s, 3H, SiMeMe′), 0.08 (s, 3H, SiMeMe′).

¹³C NMR (CDCl₃): δ 151.8, 142.0, 139.6, 138.8, 133.4, 130.7, 129.7, 125.9, 117.7, 113.8, 48.7, 19.3, 15.0, 11.7, −1.8, −1.9.

Dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,6-dimethyl-4-bromophenylamido))titanium dichloride (9)

Under an argon atmosphere, to a solution of 4.30 g (10.6 mmol) of N-(4-bromo-2,6-dimethylphenyl)(dimethyl)(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)silanamine in 200 ml of ether, 10.6 ml of 2.0 M (21.2 mmol) MeLi in ether was added dropwise over 5 minutes at −50° C. The resulting mixture was stirred overnight at this temperature. Then, to this mixture, a solution of 2.01 g (10.6 mmol) TiCl₄ in 15 ml of pentane was added dropwise with vigorous stirring over minutes at room temperature. The resulting mixture was stirred for 24 hours at ambient temperature and then evaporated to dryness. To the residue, 100 ml of toluene was added. The mixture was filtered through a glass frit (G4). The residue on the glass frit was washed with 3×30 ml of toluene. The combined filtrate was evaporated to ca. 30 ml, and 100 ml hexanes was added. The precipitate that formed was filtered off, washed with 5×50 ml of hot hexanes, and dried in vacuum. Yield 2.69 g (49%) of red solid.

Anal. calc. for C₁₉H₂₂BrCl₂NSSiTi: C, 43.62; H, 4.24. Found: C, 43.51; H, 4.33.

¹H NMR (CD₂Cl₂): δ 7.66 (d, J=5.3 Hz, 1H, 5-H in cyclopenta[b]thienyl), 7.08-7.16 (m, 3H, 4-H in cyclopenta[b]thienyl and 3,5-H in phenyl), 2.54 (s, 3H, 2/6-Me in phenyl), 2.42 (s, 3H, 6/2-Me in phenyl), 2.08 (s, 3H, 4-Me in cyclopenta[b]thienyl), 1.94 (s, 3H, 5-Me in cyclopenta[b]thienyl), 0.75 (s, 3H, SiMeMe′), 0.71 (s, 3H, SiMeMe′).

Example 10 Synthesis of dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,6-dimethyl-4-bromophenylamido))zirconium dichloride Dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl) (N-(2,6-dimethyl-4-bromophenylamido))zirconium dichloride (10)

Under an argon atmosphere, to a solution of 3.63 g (8.94 mmol) of N-(4-bromo-2,6-dimethylphenyl)(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)dimethylsilanamine in 100 ml of ether, 9.0 ml of 2.0 M (4.50 mmol) MeLi in ether was added over 5 minutes at −50° C. The resulting mixture was stirred overnight at room temperature. After cooling this mixture to −80° C., 3.37 g (8.94 mmol) of ZrCl₄ (THF)₂ was added. This mixture was stirred for 24 hours at ambient temperature, then, evaporated to dryness. To the residue, 100 ml of toluene was added. The suspension that formed was filtered through a glass frit (G4). The precipitate was additionally washed with 3×30 ml of toluene. The combined filtrate was evaporated to dryness. The resulting crude product was washed with 5×100 ml of hot hexanes using a filter (G4) funnel with a jacket, and then it was dried under vacuum. Yield 1.57 g (29%). On the evidence of ¹H NMR, the product consisted of three isomers. On the evidence of both ¹H NMR and element analysis, the isomers included different quantities of THF and ½ LiCl per Zr atom.

Anal. calc. for C_(20.48)H_(24.96)BrCl_(2.50)Li_(0.50)NO_(0.37)SSiZr: C, 39.99; H, 4.06; Cl, 14.44. Found: C, 39.99; H, 3.98; Cl, 14.55.

The ¹H NMR (CD₂Cl₂) for this compound is illustrated in FIG. 2.

Example 11 Synthesis of dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,6-diisopropyl-4-bromophenylamido))titanium dichloride (11) N-(4-Bromo-2,6-diisopropylphenyl) (4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)dimethylsilanamine

Under an argon atmosphere, to a solution of 18.9 g (73.8 mmol) of 4-bromo-2,6-diisopropylaniline in 200 ml of THF, 29.5 ml of 2.5 M (73.8 mmol) ^(n)BuLi in hexanes was added at −80° C. This mixture was warmed for ca. 1 hour to ambient temperature. Then, the resulting solution was added dropwise over ca. 1 hour, while vigorously stirring, to a solution of 17.9 g (73.8 mmol) of chloro(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)dimethylsilane in 100 ml of THF. The resulting mixture was stirred overnight at ambient temperature, and then, evaporated to dryness. To the residue, 150 ml of toluene was added. This mixture was filtered through a glass frit (G4). The filtrate was evaporated to dryness. Fractional distillation gave a yellow liquid, bp 180° C./0.1 mm Hg. The product crystallizes slowly at ambient temperature. Yield 11.9 g (35%).

Anal. calc. for C₂₃H₃₂BrNSSi: C, 59.72; H, 6.97. Found: C, 59.49; H, 6.86.

¹H NMR (CDCl₃): δ 7.22 (dd, J=5.0 Hz, J=0.7 Hz, 1H, 3-H in cyclopenta[b]thienyl), 7.11 (s, 2H, 3,5-H in phenyl), 7.00 (d, J=5.0 Hz, 1H, 2-H in cyclopenta[b]thienyl), 3.42 (m, 1H, 6-H in cyclopenta[b]thienyl), 3.14 (hept., J=6.9 Hz, 2H, 2,6-CHMeMe′ in phenyl), 2.20 (br.s, 1H, NH), 2.16 (s, 3H, 5-Me in cyclopenta[b]thienyl), 2.13 (m, 3H, 4-Me in cyclopenta[b]thienyl), 1.12 (d, J=6.9 Hz, 6H, 2,6-CHMeMe′ in phenyl), 1.09 (d, J=6.9 Hz, 6H, 2,6-CHMeMe′ in phenyl), 0.10 (s, 3H, SiMeMe′), −0.01 (s, 3H, SiMeMe′).

¹³C NMR (CDCl₃): δ 151.8, 146.9, 139.6, 138.7, 138.0, 129.7, 126.1, 125.8, 117.7, 117.2, 48.9, 28.2, 23.4, 14.9, 11.7, −2.5, −2.7.

Dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,6-diisopropyl-4-bromophenylamido))titanium dichloride (11)

Under an argon atmosphere, to a solution of 3.40 g (7.36 mmol) of N-(4-bromo-2,6-diisopropylphenyl)(dimethyl)(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl) silanamine in 200 ml of ether, 7.36 ml of 2.0 M (14.7 mmol) MeLi in ether was added in one portion at room temperature. The resulting mixture was stirred overnight at this temperature. Then, to this mixture, a solution of 1.40 g (7.36 mmol) TiCl₄ in 10 ml of pentane was added dropwise, while vigorously stirring, over 30 minutes at 0° C. The resulting mixture was stirred for 24 hours at ambient temperature and then evaporated to dryness. To the residue, 100 ml of toluene was added. The mixture was filtered through a glass frit (G4) at 50° C. using a filter funnel with a jacket. The filtrate was evaporated to dryness. The crude product was extracted with 4×80 ml of hot hexanes using a filter (G4) funnel with a jacket. The combined hexanes extracts were evaporated to ca. 70 ml. Crystals that precipitated at −30° C. were collected, washed with 2×10 ml of cold hexanes, and dried in vacuum. Yield 1.40 g (33%) of red crystalline solid.

Anal. calc. for C₂₃H₃₀BrCl₂NSSiTi: C, 47.68; H, 5.22. Found: C, 47.83; H, 5.31.

¹H NMR (CD₂Cl₂): δ 7.66 (d, J=5.6 Hz, 1H, 3-H in phenyl), 7.13 (d, J=2.5 Hz, 1H, 2-H in cyclopentathienyl), 7.09 (d, J=2.5 Hz, 1H, 3-H in cyclopentathienyl), 7.06 (d, J=5.6 Hz, 1H, 5-H in phenyl), 2.80 (hept, J=6.7 Hz, 1H, 5-CHMe₂), 2.70 (hept, J=6.6 Hz, 1H, 3-CHMe₂), 2.49 (s, 3H, 4-Me in cyclopentathienyl), 2.40 (s, 3H, 5-Me in cyclopentathienyl), 1.19 (d, J=6.6 Hz, 3H, 3-CHMeMe′ in phenyl), 1.02 (d, J=6.6 Hz, 3H, 3-CHMeMe′ in phenyl), 1.00 (d, J=6.7 Hz, 3H, 5-CHMeMe′ in phenyl), 0.97 (d, J=6.7 Hz, 3H, 5-CHMeMe′ in phenyl), 0.77 (m, 3H, SiMeMe′), 0.71 (m, 3H, SiMeMe′).

¹³C NMR (CD₂Cl₂): δ 147.5, 146.9, 146.4, 145.4, 144.5, 144.4, 138.8, 133.5, 129.3, 129.1, 122.0, 121.6, 121.2, 29.8, 29.3, 28.2, 28.0, 25.4, 24.9, 18.9, 15.3, 4.1, 3.9.

Example 12 Synthesis of dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,6-diisopropyl-4-bromophenylamido))zirconium dichloride (12) Dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta/b thien-6-yl)(N-(2,6-diisopropyl-4-bromophenylamido))zirconium dichloride (12)

Under an argon atmosphere, to a solution of 4.61 g (10.6 mmol) of N-(4-bromo-2,6-diisopropylphenyl)(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)dimethylsilanamine in 100 ml of ether, 10.6 ml of 2.0 M (10.6 mmol) MeLi in ether was added in one portion at −30° C. This mixture was warmed to room temperature, and then stirred for 4 hours at this temperature. After cooling this mixture to −80° C., 4.00 g (10.6 mmol) ZrCl₄ (THF)₂ was added. This mixture was stirred for 24 hours at ambient temperature, and then was evaporated to dryness. To the residue, 80 ml of toluene was added. The suspension that formed was filtered through a glass frit (G4). The filtrate was evaporated to ca. 40 ml. Crystals that precipitated from this toluene solution at −30° C. were collected, washed with 2×20 ml of hexanes, and dried in vacuum. Yield 4.62 g (56%).

Anal. calc. for C₂₃H₃₀BrCl₂NSSiZr: C, 44.36; H, 4.86. Found: C, 44.50; H, 4.93.

¹H NMR (CD₂Cl₂): δ 7.54 (d, J=5.6 Hz, 1H, 3-H in phenyl), 7.12 (d, J=2.5 Hz, 1H, 2-H in cyclopentathienyl), 7.10 (d, J=5.6 Hz, 1H, 5-H in phenyl), 7.09 (d, J=2.5 Hz, 1H, 3-H in cyclopentathienyl), 3.06 (hept, J=6.7 Hz, 1H, 5-CHMe₂), 3.02 (hept, J=6.7 Hz, 1H, 3-CHMe₂), 2.49 (s, 3H, 4-Me in cyclopentathienyl), 2.44 (s, 3H, 5-Me in cyclopentathienyl), 1.21 (d, J=6.7 Hz, 3H, 3-CHMeMe′ in phenyl), 1.10 (d, J=6.7 Hz, 3H, 3-CHMeMe′ in phenyl), 1.08 (d, J=6.7 Hz, 6H, 5-CHMe₂ in phenyl), 0.72 (m, 3H, SiMeMe′), 0.67 (m, 3H, SiMeMe′).

¹³C NMR (CD₂Cl₂): δ 148.6, 147.9, 142.6, 141.9, 140.0, 139.7, 139.5, 136.8, 130.6, 129.8, 125.4, 120.6, 120.5, 29.7, 29.2, 27.6, 27.4, 25.9, 25.4, 17.5, 14.0, 4.3, 4.2.

Example 13 Synthesis of rac-dimethylsilanediyl-bis(η⁵-3-bromo-4,5-dimethylcyclopenta[b]thien-6-yl)zirconium dichloride (13) 3-Bromo-4,5-dimethyl-4,5-dihydro-6H-cyclopenta[b]thiophen-6-one

To a suspension of 29.3 g (220 mmol) of AlCl₃ in 40 ml of chloroform a solution of 16.4 g (100 mmol) of 4,5-dimethyl-4,5-dihydro-6H-cyclopenta[b]thiophen-6-one in 15 ml of chloroform was added while vigorously stirring for 30 min at 0° C. This mixture was stirred for 15 min; then, a solution of 5.48 ml (17.1 g, 107 mmol) of bromine in 10 ml of chloroform was added dropwise over 1 h at 0° C. The resulting mixture was stirred for 1.5 h at room temperature and then poured on 200 cm³ of ice. The mixture was acidified with 4 M HCl to pH 1. The organic layer was separated, and the aqueous layer was washed with 3×100 ml of dichloromethane. The combined organic fractions were dried over K₂CO₃ and evaporated to dryness. The product was isolated by vacuum distillation, bp 110-112° C./2 mm Hg. Yield 22.1 g (91%).

Anal. calc. for C₉H₉BrOS: C, 44.46; H, 3.73. Found: C, 44.58; H, 3.61.

¹H NMR (CDCl₃): major diastereomer (trans): δ 7.74 (s, 1H, 2-H), 2.86 (dq, J=7.3 Hz, J=2.7 Hz, 1H, 4-H), 2.53 (dq, J=7.3 Hz, J=2.7 Hz, 1H, 5-H), 1.43 (d, J=7.3 Hz, 3H, 4-Me), 1.29 (d, J=7.3 Hz, 3H, 5-Me); minor diastereomer (cis), 7.73 (s, 1H, 2-H), 3.37 (m, 1H, 4-H), 3.10 (m, 1H, 5-H), 1.23 (d, J=7.3 Hz, 3H, 4-Me), 1.20 (d, J=7.5 Hz, 3H, 5-Me).

4,5-Dimethyl-4H-cyclopenta[b]thiophene

To a solution of 132.4 g (0.54 mol) of 3-bromo-4,5-dimethyl-4,5-dihydro-6H-cyclopenta[b]thiophen-6-one in 750 ml of THF-methanol (2:1, vol.), 28.6 g (0.75 mol) of NaBH₄ was added in small portions while vigorously stirring over 1 h at 5° C. This mixture was stirred overnight at ambient temperature and then added to ca. 1000 cm³ of cold water. The organic layer was separated; the aqueous layer was extracted with 2×300 ml of methyl-tert-butyl ether. The combined extract was dried over K₂CO₃ and evaporated to dryness. To a hot solution of the residue in 1500 cm³ of toluene, 0.5 g of para-toluenesulfonic acid was added. This mixture was refluxed for 15 min, cooled to room temperature, and passed through a short Silica Gel 60 column (40-63 μm, d 65 mm, 1 150 mm). The column was additionally washed with hexanes to isolate the product. The obtained solution was evaporated to dryness. Fractional distillation gave a colorless oil, bp 101-104° C./2 mm Hg. Yield 92.8 g (75%).

Anal. calc. for C₉H₉BrS: C, 47.18; H, 3.96. Found: C, 47.27; H, 3.90.

¹H NMR (CDCl₃): δ 6.91 (s, 1H, 2-H), 6.28 (m, 1H, 6-H), 3.10 (dq, J=7.8 Hz, J=1.0 Hz, 1H, 4-H), 2.03 (d, J=1.5 Hz, 3H, 5-Me), 1.32 (d, J=7.8 Hz, 3H, 4-Me).

Bis(3-bromo-4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)(dimethyl)silane

To a solution of 5.0 g (21.8 mmol) of 4,5-dimethyl-4H-cyclopenta[b]thiophene in 200 ml of ether 11.0 ml (21.8 mmol) of 1.98 M MeLi in ether was added while vigorously stirring for 30 min at −55° C. The mixture was stirred for 30 min at this temperature and then 10 h at ambient temperature. Next, 1.41 g (10.9 mmol) of dichlorodimethylsilane was added. The resulting mixture was stirred for 36 h at ambient temperature, and then 200 ml of water was added. The organic layer was separated, dried over Na₂SO₄, and evaporated to dryness. The residue was washed with 3×50 ml of hexanes and dried in vacuum. This procedure gave 3.20 g (57%) of a ca. 1:2 mixture of rac- and meso-products.

Anal. calc. for C₂₀H₂₂Br₂S₂Si: C, 46.70; H, 4.31. Found: C, 46.92; H, 4.54.

¹H NMR (CDCl₃): δ 7.09 (m, 2H, 5,5′-H in rac-isomer), 7.07 (m, 2H, 5,5′-H in meso-isomer), 3.61 (m, 2H, 1,1′-H in rac-isomer), 3.51 (m, 2H, 1,1′-H in meso-isomer), 2.23 (m, 6H, 3,3′-Me in meso-isomer), 2.20 (m, 6H, 3,3′-Me in rac-isomer), 2.09 (m, 6H, 2,2′-Me in meso-isomer), 1.96 (m, 6H, 2,2′-Me in rac-isomer), −0.17 (s, 3H, SiMeMe in meso-isomer), −0.22 (s, 6H, SiMe₂ in rac-isomer), −0.29 (s, 3H, SiMeMe in meso-isomer).

¹³C NMR (CDCl₃): δ 147.6, 141.0, 140.3, 140.2, 130.2, 122.9, 122.7, 102.5, 45.4, 45.2, 15.1, 14.8, 11.4, 11.3, −6.0, −6.7, −7.9.

Rac-[dimethylsilyl-bis(η⁵-3-bromo-4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)](N¹N³-diphenyl-1,3-propanediamido)zirconium

In the Glove Box, to a solution of 6.02 g (11.7 mmol) of rac-/meso-bis(4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)(dimethyl)silane in 700 ml of diethyl ether 11.8 ml (23.4 mmol) of 1.98 M MeLi in ether was added at room temperature. This mixture was stirred for 3 h at 20° C. To the solution obtained 6.19 g (11.7 mmol) of (N¹,N³-diphenyl-1,3 propanediamido)bis(tetrahydrofurano) zirconium dichloride was added at −80° C. The resulting mixture was stirred for 48 h at ambient temperature and, then, evaporated to dryness. The residue was dissolved in 200 ml of toluene. This toluene solution was filtered through Celite 503. The Celite layer was additionally washed with 100 ml of toluene. The combined filtrate was evaporated to dryness. The residue was washed with 4×50 ml of hexanes and dried in vacuum. Yield 6.49 g (67%) of orange solid.

Anal. calc. for C₃₅H₃₆Br₂N₂S₂SiZr: C, 50.77; H, 4.38. Found: C, 51.04; H, 4.55.

¹H NMR (CD₂Cl₂): δ 7.18 (m, 4H, 3,3′,5,5′-H in Ph), 6.89 (m, 2H, 4,4′-H in Ph), 6.78 (m, 4H, 2,2′,6,6′-H in Ph), 6.26 (s, 2H, 5,5′-H in indenyl), 3.70 (dt, J=15.6 Hz, J=3.2 Hz, 2H, 1′,3′-H in propylidene), 3.50 (dt, J=15.0 Hz, J=7.7 Hz, 2H, 1,3-H in propylidene), 2.26 (s, 6H, 3,3′-CH₃), 1.62 (s, 6H, 2,2′-CH₃), 1.22-1.35 (m, 2H, 2,2′-H in propylidene), 0.79 (s, 6H, SiMe₂).

Rac-[dimethylsilyl-bis(η⁵-3-bromo-4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)zirconium dichloride (13)

In the Glove Box, to a solution of 0.45 g (0.54 mmol) of rac-[dimethylsilyl-bis(η5-4,5-dimethyl-6H-cyclopenta[b]thien-6-yl)](N¹,N³-diphenyl-1,3-propanediamido)zirconium in 40 ml of diethyl ether-CH₂Cl₂ (1:1, vol.), 1.10 ml of cold 1.0 M solution of HCl in ether was added at −80° C. for 10 min. This mixture was stirred and slowly warmed to ca. 0° C. during ca. 2 h and then evaporated (at this temperature) to dryness. The residue was washed with 3×4 ml of dichloromethane (using a centrifuge) and dried in vacuum. Yield 0.12 g (33%) of orange crystalline solid.

Anal. calc. for C₂₀H₂₀Br₂Cl₂S₂SiZr: C, 35.61; H, 2.99. Found: C, 35.49; H, 3.11.

¹H NMR (CD₂Cl₂): δ 7.22 (s, 2H, 5,5′-H), 2.37 (s, 6H, 3,3′-Me), 2.06 (s, 6H, 2,2′-Me), 1.05 (s, 6H, SiMe₂).

EXPERIMENTAL Polymerizations

In the following experiments pressure is reported in atmospheres (atm) and pounds per square inch (psi). The conversion factors to S. I. Units are:

1 psi equals 6.894757 kPa and 1 atm equals 101.325 kPa.

Transition metal compound (TMC) solutions were typically prepared using toluene (ExxonMobil Chemical—anhydrous, stored under N₂) (98%). Unless otherwise mentioned, TMC solutions are 0.2 mmol/L for C₂ and C₂/C₈ (co)polymerizations, and 0.6 mmol/L for C₃ polymerizations.

Solvents, polymerization grade toluene and hexanes were supplied by ExxonMobil Chemical Co. and thoroughly dried and degassed prior to use.

1-octene (98%) was purchased from Aldrich Chemical Company and dried by stirring over NaK overnight followed by filtration through basic alumina (Aldrich Chemical Company, Brockman Basic 1).

Polymerization grade ethylene was used and further purified by passing it through a series of columns: 500 cc Oxyclear cylinder from Labelear (Oakland, Calif.) followed by a 500 cc column packed with dried 3A mole sieves purchased from Aldrich Chemical Company, and a 500 cc column packed with dried 5 Å mole sieves purchased from Aldrich Chemical Company.

Polymerization grade propylene was used without further purification.

MAO (methylalumoxane, 10 wt % in toluene) was purchased from Albemarle Corporation and was used as a 1 wt % or 2 wt % in toluene solution. Micromoles of MAO reported in the experimental section are based on the micromoles of aluminum in MAO. The formula weight of MAO is 58.0 grams/mole.

Reactor Description and Preparation:

Polymerizations were conducted in an inert atmosphere (N2) drybox using autoclaves equipped with an external heater for temperature control, glass inserts (internal volume of reactor=23.5 mL for C2 and C2/C8 runs; 22.5 mL for C3 and C2/C3 runs), septum inlets, regulated supply of nitrogen, ethylene and propylene, and equipped with disposable PEEK mechanical stirrers (800 RPM). The autoclaves were prepared by purging with dry nitrogen at 110° C. or 115° C. for 5 hours and then at 25° C. for 5 hours.

Ethylene Polymerization or Ethylene/1-Octene Copolymerization:

The reactor was prepared as described above, and then purged with ethylene. Toluene, 1-octene (100 μL when used), and activator (MAO) were added via syringe at room temperature and atmospheric pressure. The reactor was then brought to process temperature (80° C.) and charged with ethylene to process pressure (75 psig=618.5 kPa) while stirring at 800 RPM. The transition metal compound (TMC, 0.02 μmol) was added via syringe with the reactor at process conditions. In cases where some MAO (0.4 μmol of Al) was also precontacted with the TMC, it was added to the TMC first and then the resulting solution was added to the reactor at process conditions. Amounts of reagents not specified above are given in Tables 1 and 3. Ethylene was allowed to enter (through the use of computer controlled solenoid valves) the autoclaves during polymerization to maintain reactor gauge pressure (+/−2 psig). Reactor temperature was monitored and typically maintained within +/−1° C. Polymerizations were halted by addition of approximately 50 psi O2/Ar (5 mole % O₂) gas mixture to the autoclaves for approximately 30 seconds. The polymerizations were quenched after a predetermined cumulative amount of ethylene had been added or for a maximum of 20 minutes polymerization time. The final conversion (in psi) of ethylene added/consumed is reported in the Tables 1 and 3, in addition to the quench time for each run. The reactors were cooled and vented. The polymer was isolated after the solvent was removed in-vacuo. Yields reported include total weight of polymer and residual catalyst. Catalyst activity is reported as grams of polymer per mmol transition metal compound per atmosphere ethylene per hour of reaction time (g/mmol·hr·atm).

Propylene Polymerization:

The reactor was prepared as described above, then heated to 40° C. and then purged with propylene gas at atmospheric pressure. Hexanes, MAO, and liquid propylene (1.066 mL, unless indicated otherwise in Table 5) were added via syringe. The reactor was then heated to process temperature (70° C.) while stirring at 800 RPM. The TMC was added via syringe with the reactor at process conditions. In cases where some MAO (0.4 μmol of Al) was also precontacted with the TMC, it was added to the TMC first and then the resulting solution was added to the reactor at process conditions. Amounts of reagents not specified above are given in Table 5. Reactor temperature was monitored and typically maintained within +/−1° C. Polymerizations were halted by addition of approximately 50 psi O₂/Ar (5 mole % O₂) gas mixture to the autoclaves for approximately 30 seconds. The polymerizations were quenched based on a predetermined pressure loss of approximately 5 psi. The actual quench time is reported in Table 5 for each run. The reactors were cooled and vented. The polymer was isolated after the solvent was removed in-vacuo. Yields reported include total weight of polymer and residual catalyst. Catalyst activity is reported as grams of polymer per mmol transition metal compound per hour of reaction time (g/mmol·hr).

Polymer Characterization:

Polymer characterization results for polyethylene samples are reported in Table 2, for ethylene-1-octene copolymers are reported in Table 4, and for polypropylene samples are reported in Table 6.

For analytical testing, polymer sample solutions were prepared by dissolving polymer in 1,2,4-trichlorobenzene (TCB, 99+% purity from Sigma-Aldrich) containing 2,6-di-tert-butyl-4-methylphenol (BHT, 99% from Aldrich) at 160° C. in a shaker oven for approximately 3 hours. The typical concentration of polymer in solution is between 0.4 to 0.9 mg/mL with a BHT concentration of 1.25 mg BHT/mL of TCB. Samples are cooled to 135° C. for testing.

Molecular weights (weight average molecular weight (Mw) and number average molecular weight (Mn)) and molecular weight distribution (MWD=Mw/Mn), which is also sometimes referred to as the polydispersity (PDI) of the polymer, were measured by Gel Permeation Chromatography using a Symyx Technology GPC equipped with evaporative light scattering detector and calibrated using polystyrene standards (Polymer Laboratories: Polystyrene Calibration Kit S-M-10: Mp (peak Mw) between 5000 and 3,390,000). Samples were run in TCB at (135° C. sample temperatures, 160° C. oven/columns) using three Polymer Laboratories: PLgel 10 μm Mixed-B 300×7.5 mm columns in series. No column spreading corrections were employed. Numerical analyses were performed using Epoch® software available from Symyx Technologies.

The sample preparation for SAMMS (Sensory Array Modular Measurement System) thermal analysis measurements involved depositing the stabilized polymer solution onto a silanized wafer (Part Number S10457, Symyx). The solvent was then evaporated off at ˜145° C. By this method, approximately between 0.12 and 0.24 mg of polymer is deposited onto each corresponding wafer cell. Thermal analysis was measured on a Symyx Technologies SAMMS instrument that measures polymer melt temperatures via the 3 Co technique. The analysis first employs a rapid-scan protocol that heats each cell from 27° C. to 200° C. in ˜35 seconds and then rapidly cools the sample to room temperature. This complete procedure takes approximately 60 seconds per cell and is used to minimize each sample's thermal history. The second step involves running a high-resolution scan protocol to measure the second melt of the sample. The protocol heats each cell from 27° C. to 200° C. in ˜3 minutes and then rapidly cools the sample to room temperature. The high-resolution scan takes approximately three times the amount of time to complete as the rapid-scan protocol. If multiple melting peaks are present, Epoch® Software reports the largest amplitude peak. SAMMS data is reported under the heading of Tm (° C.) in Tables 2, 4, and 6.

Samples for infrared analysis were prepared by depositing the stabilized polymer solution onto a silanized wafer (Part number S10860, Symyx). By this method, approximately between 0.12 and 0.24 mg of polymer is deposited on the wafer cell. The samples were subsequently analyzed on a Brucker Equinox 55 FTIR spectrometer equipped with Pikes's MappIR specular reflectance sample accessory. Spectra, covering a spectral range of 5000 cm⁻¹ to 500 cm⁻¹, were collected at a 2 cm⁻¹ resolution with 32 scans.

For ethylene-1-octene copolymers, the wt. % copolymer is determined via measurement of the methyl deformation band at ˜1375 cm⁻¹. The peak height of this band is normalized by the combination and overtone band at ˜4321 cm⁻¹, which corrects for path length differences. The normalized peak height is correlated to individual calibration curves from ¹H NMR data to predict the wt. % copolymer content within a concentration range of ˜2 to 35 wt. % for octene. Typically, R² correlations of 0.98 or greater are achieved. These numbers are reported in Table 4 under the heading Octene wt %).

TABLE 1 Ethylene Polymerization Runs - Part I. Acti- Total Final Quench Activity Acti- vator^(a) Toluene Conver- Time Polymer (g/(mmol · Ex # TMC vator (μmol) (mL) sion (psi) (sec) Yield (g) hr · atm)) PE-1 1 MAO 9.98 3.80 25.0 393.9 0.061 4,568 PE-2 1 MAO 9.98 3.80 25.0 386.9 0.063 4,803 PE-3 1 MAO 9.98 3.80 25.0 481.9 0.063 3,857 PE-4 1 MAO 9.98 3.80 25.0 370.8 0.068 5,408 PE-5 2 MAO 10.00 5.00 20.1 246.9 0.0851 10,166 PE-6 2 MAO 10.00 5.00 20.1 259.0 0.0876 9,977 PE-7 2 MAO 10.00 5.00 20.1 216.2 0.0842 11,487 PE-8 2 MAO 10.00 5.00 20.1 226.1 0.0809 10,553 PE-9 3 MAO 10.00 5.00 20.1 62.1 0.0705 33,459 PE-10 3 MAO 10.00 5.00 20.3 60.6 0.0787 38,325 PE-11 3 MAO 10.00 5.00 20.3 75.2 0.0702 27,524 PE-12 3 MAO 10.00 5.00 20.1 79.7 0.0664 24,571 PE-13 4 MAO 10.00 5.00 20.1 39.8 0.0876 64,839 PE-14 4 MAO 10.00 5.00 20.1 44.4 0.0838 55,708 PE-15 4 MAO 10.00 5.00 20.3 47.3 0.0900 56,183 PE-16 4 MAO 10.00 5.00 20.1 39.6 0.0898 66,938 ^(a)Micromoles refers to the micromoles of Al in MAO.

TABLE 2 Ethylene Polymerization Runs - Part II. Tm Ex # TMC Mw Mn PDI (° C.) PE-1 1 951,928 601,157 1.6 139.7 PE-2 1 958,001 603,691 1.6 140.1 PE-3 1 927,089 557,646 1.7 140.0 PE-4 1 963,229 597,109 1.6 136.4 PE-5 2 991,858 458,656 2.2 — PE-6 2 1,041,400 499,885 2.1 — PE-7 2 1,077,032 530,034 2.0 — PE-8 2 997,484 471,213 2.1 — PE-9 3 465,370 285,053 1.6 — PE-10 3 470,292 286,126 1.6 — PE-11 3 457,983 282,735 1.6 — PE-12 3 479,226 298,595 1.6 — PE-13 4 635,286 344,050 1.8 — PE-14 4 537,856 302,816 1.8 — PE-15 4 634,617 347,620 1.8 — PE-16 4 582,407 325,101 1.8 —

TABLE 3 Ethylene-1-Octene Polymerization Runs - Part I. Acti- Total Final Quench Activity Acti- vator^(a) Toluene Conver- Time Polymer (g/(mmol · Ex # TMC vator (μmol) (mL) sion (psi) (sec) Yield (g) hr · atm)) EO-1 1  MAO 9.98 3.80 25.0 286.1 0.063 6,495 EO-2 1  MAO 9.98 3.80 25.0 465.2 0.069 4,375 EO-3 1  MAO 9.98 3.80 25.0 174.2 0.057 9,652 EO-4 1  MAO 9.98 3.80 25.2 208.5 0.062 8,771 EO-5 2  MAO 10.00 4.90 20.6 65.1 0.0803 36,378 EO-6 2  MAO 10.00 4.90 20.5 62.2 0.0814 38,620 EO-7 2  MAO 10.00 4.90 20.1 65.0 0.0856 38,820 EO-8 2  MAO 10.00 4.90 20.5 72.3 0.0897 36,615 EO-9 3  MAO 10.00 4.90 20.5 79.6 0.0737 27,293 EO-10 3  MAO 10.00 4.90 20.5 69.3 0.0774 32,967 EO-11 3  MAO 10.00 4.90 20.1 76.8 0.0681 26,144 EO-12 3  MAO 10.00 4.90 20.5 76.5 0.0740 28,532 EO-13 4  MAO 10.00 4.90 20.1 41.4 0.0990 70,602 EO-14 4  MAO 10.00 4.90 20.8 42.8 0.1008 69,467 EO-15 4  MAO 10.00 4.90 20.6 39.9 0.1002 74,129 EO-16 4  MAO 10.00 4.90 20.1 44.1 0.1027 68,674 EO-17 6^(b) MAO 10.00 4.90 20.3 54.6 0.1157 62,509 EO-18 6^(b) MAO 10.00 4.90 20.5 53.0 0.1197 66,622 EO-19 6^(b) MAO 10.00 4.90 20.5 56.3 0.1213 63,555 EO-20 7^(c) MAO 10.00 4.90 8.9 1200.4 0.0084 206 EO-21 7^(c) MAO 10.00 4.90 7.3 1200.6 0.0094 231 EO-22 7^(c) MAO 10.00 4.90 6.7 1200.9 0.0088 216 EO-23 8^(c) MAO 10.00 4.90 4.7 1200.5 0.0024 59 EO-24 8^(c) MAO 10.00 4.90 5.0 1200.0 0.0044 108 EO-25 8^(c) MAO 10.00 4.90 4.1 1200.9 0.0015 37 EO-26 9^(c) MAO 10.00 4.90 6.3 1200.1 0.0027 66 EO-27 9^(c) MAO 10.00 4.90 3.2 1200.0 0.0027 66 EO-28 10^(c)  MAO 10.00 4.90 7.9 1201.5 0.0106 260 EO-29 10^(c)  MAO 10.00 4.90 7.0 1200.3 0.0086 211 EO-30 10^(c)  MAO 10.00 4.90 9.9 1200.1 0.0095 234 EO-31 11^(b)  MAO 10.00 4.90 7.6 1200.9 0.0117 287 EO-32 11^(b)  MAO 10.00 4.90 5.8 1201.2 0.0072 177 EO-33 11^(b)  MAO 10.00 4.90 5.0 1201.4 0.0048 118 EO-34 12^(b)  MAO 10.00 4.90 6.7 1200.8 0.009 221 EO-35 12^(b)  MAO 10.00 4.90 5.5 1201.5 0.0063 155 EO-36 12^(b)  MAO 10.00 4.90 4.3 1201.5 0.0000 0 EO-37 13^(c)  MAO 10.00 4.90 20.1 47.1 0.0827 51,794 EO-38 13^(c)  MAO 10.00 4.90 20.3 46.9 0.0925 58,180 EO-39 13^(c)  MAO 10.00 4.90 20.5 43.9 0.0887 59,602 ^(a)Micromoles refers to the micromoles of Al in MAO. ^(b)In this experiment, an additional 20 equivalents (relative to the TMC) of MAO was premixed with the indicated TMC. ^(c)In this experiment, an additional 20 equivalents (relative to the TMC) of MAO was premixed with the indicated TMC and the complex formed was heated for 20 min using a hot plate set at 80° C.

TABLE 4 Ethylene-1-Octene Polymerization Runs - Part II. Octene Ex # TMC Mw Mn PDI (wt %) Tm (° C.) EO-1 1 708,716 395,668 1.8 4.6 120.2 EO-2 1 787,008 440,827 1.8 3.8 121.3 EO-3 1 631,556 381,486 1.7 3.6 122.7 EO-4 1 671,204 413,683 1.6 3.6 122.6 EO-5 2 471,599 214,462 2.2 8.3 — EO-6 2 480,317 218,689 2.2 8.5 — EO-7 2 498,881 214,071 2.3 8.5 — EO-8 2 499,921 211,350 2.4 8.3 — EO-9 3 365,689 227,725 1.6 16.1 — EO-10 3 377,980 234,016 1.6 16.3 — EO-11 3 372,546 233,421 1.6 13.9 — EO-12 3 393,933 249,939 1.6 14.5 — EO-13 4 338,672 204,082 1.7 19.8 — EO-14 4 345,766 206,020 1.7 19.2 — EO-15 4 344,472 206,766 1.7 18.7 — EO-16 4 341,178 202,572 1.7 18.4 — EO-17 6 373,730 187,734 2.0 24.2 — EO-18 6 388,340 190,337 2.0 23.8 101.2 EO-19 6 383,557 192,563 2.0 22.9 101.5 EO-20 7 — — — — — EO-21 7 — — — — — EO-22 7 — — — — — EO-23 8 — — — — — EO-24 8 — — — — — EO-25 8 — — — — — EO-26 9 — — — — — EO-27 9 — — — — — EO-28 10 — — — 2.9 — EO-29 10 — — — — — EO-30 10 — — — — — EO-31 11 — — — 6.6 — EO-32 11 — — — — — EO-33 11 — — — — — EO-34 12 — — — — — EO-35 12 — — — — — EO-36 12 — — — — — EO-37 13 330,614 198,621 1.7 7.5 119.6 EO-38 13 302,614 172,086 1.8 6.5 120.6 EO-39 13 325,705 183,991 1.8 6.3 122.3

TABLE 5 Propylene Polymerization Runs - Part I. Quench Polymer Activity TMC MAO^(a) Toluene Hexanes Propene Time Yield (g/(mmol · Ex # TMC μmol μmol μL μL μL (sec) (g) hr)) PP-1  6^(b) 0.10 50 324 3707 1066 49.0 0.2045 150,245 PP-2  6^(b) 0.10 50 324 3707 1066 53.7 0.1903 129,998 PP-3  6^(b) 0.10 50 324 3707 1066 53.0 0.1737 117,985 PP-4 13^(c) 0.08 40 259 3773 1066 297.3 0.0770 11,654 PP-5 13^(c) 0.08 40 259 3773 1066 310.9 0.0759 10,986 PP-6 13^(c) 0.08 40 259 3773 1066 350.0 0.0669 8,601 ^(a)Micromoles refers to the micromoles of Al in MAO. ^(b)In this experiment, an additional 20 equivalents (relative to the TMC) of MAO was premixed with the indicated TMC. ^(c)In this experiment, an additional 20 equivalents (relative to the TMC) of MAO was premixed with the indicated TMC and the complex formed was heated for 20 min using a hot plate set at 80° C.

TABLE 6 Propylene Polymerization Runs - Part II. Ex # TMC Mw Mn PDI Tm (° C.) PP-1 6 88,872 54,188 1.6 150.1 PP-2 6 94,566 58,270 1.6 149.8 PP-3 6 97,457 60,770 1.6 149.5 PP-4 13 5,076 3,506 1.4 — PP-5 13 5,083 3,532 1.4 — PP-6 13 5,120 3,528 1.5 —

While the present invention has been described and illustrated by reference to particular embodiments, those of ordinary skill in the art will appreciate that the invention lends itself to variations not necessarily illustrated herein. For this reason, then, reference should be made solely to the appended claims for purposes of determining the true scope of the present invention. All documents described herein are incorporated by reference herein, including any priority documents and/or testing procedures to the extent they are not inconsistent with this text. Likewise, the term “comprising” is considered synonymous with the term “including” for purposes of Australian law. 

1. A metallocene compound represented by the formula (1): AMX_(n-1) M is a transition metal atom having a coordination number of n selected from Group 3, 4, 5 or 6 of the Periodic Table of Elements, or a lanthanide metal atom, or actinide metal atom; A is a substituted monocyclic or polycyclic ligand that is pi-bonded to M and is substituted with at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position of the ligand, wherein said ligand also includes one or more ring heteroatoms selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; and each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand.
 2. The compound of claim 1 wherein A is a substituted heterocyclopentadienyl ligand, a substituted heteroindenyl ligand, a substituted heterofluorenyl ligand, or a substituted heterocyclopentanaphthyl ligand.
 3. The compound of claim 1 wherein each heteroatom is selected from boron, nitrogen, oxygen, phosphorus, and sulfur.
 4. The compound of claim 1 wherein A is selected from substituted arsacyclopentadienyl ligands, substituted azaboratabenzene ligands, substituted azaborindenyl ligands, substituted azaborollide ligands, substituted azacyclopentadienyl ligands, substituted benzothiaborollide ligands, substituted boratabenzene ligands, substituted boracyclopentadienyl ligands, substituted cyclopentathienyl ligands, substituted cyclopentabenzothienyl ligands, substituted cyclopentafuryl ligands, substituted cyclopentapyrrolyl ligands, substituted cyclopentapyridyl ligands, substituted cyclopentaphospholyl ligands, substituted cyclopentaphosphinyl ligands, substituted cyclopentaindolyl ligands, substituted cyclopentaquinolyl ligands, substituted indenodioxolyl ligands, substituted indenothienyl ligands, substituted indenopyridyl ligands, substituted indenophosphinyl ligands, substituted indenofuryl ligands, substituted indenobenzothienyl ligands, substituted indenoindolyl ligands, substituted oxaborollide ligands, substituted phosphaboratabenzene ligands, substituted stibacyclopentadienyl ligands and substituted thiaborollide ligands.
 5. The compound of claim 1 wherein M is a Group 4 transition metal atom selected from titanium, zirconium or hafnium.
 6. The compound of claim 1 wherein said at least one halogen substituent is a chloro, bromo or iodo substituent.
 7. The compound of claim 1 wherein said at least one halogen substituent is a chloro or bromo substituent.
 8. A metallocene compound represented by the formula (1)(a):

or the formula (1)(b)

wherein M is a group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; Z is a ring heteroatom selected from boron and a Group 15 atom; G is a divalent C₂ to C₄₀ group which forms a monocyclic or polycyclic ring structure fused to the cyclopentadienyl ring and which contains at least one ring heteroatom selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, and a Group 16 atom; each R is bonded to any bondable ring position of the ring structure ligand in formulas (1)(a) and (1)(b) including the G group, and is, independently, a hydrogen, hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl, germylcarbyl, or heteroatom substituent wherein the heteroatom is selected from boron, Group 15 atoms, or Group 16 atoms, and optionally, two or more adjacent R may join together to form a substituted or unsubstituted, saturated, partially unsaturated, or aromatic cyclic or polycyclic substituent; x represents the number of R substituents bonded to the ring structure ligand; each X* is bonded to any sp² carbon atom at a bondable ring position in formulae (1)(a) and (1)(b), including the G group, and is a halogen substituent; z represents the number of X* substituents bonded to the ring structure ligand and is at least one; and each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand.
 9. The compound of claim 8 wherein M is a Group 4 transition metal atom selected from titanium, zirconium or hafnium.
 10. The compound of claim 8 wherein Z is boron, nitrogen, or phosphorus.
 11. The compound of claim 8 wherein said at least one ring heteroatom in G is selected from boron, nitrogen, oxygen, phosphorus, and sulfur.
 12. The compound of claim 8 wherein each R is independently selected from hydrogen and a C₁ to C₃₀ hydrocarbyl.
 13. The compound of claim 8 wherein each R is independently selected from hydrogen and methyl.
 14. The compound of claim 8 wherein R includes a heteroatom substituent and the heteroatom is selected from boron, nitrogen, oxygen, phosphorus, and sulfur.
 15. The compound of claim 8 wherein each X* is a chloro, bromo or iodo substituent.
 16. The compound of claim 8 wherein each X* is a chloro or bromo substituent. 17.-27. (canceled)
 28. A metallocene compound represented by the formula (3):

wherein M is a Group 3, 4, 5 or 6 transition metal atom, or a lanthanide metal atom, or actinide metal atom; A is a substituted or unsubstituted monocyclic or polycyclic ligand pi-bonded to M, wherein A includes one or more ring heteroatoms selected from boron, a Group 14 atom that is not carbon, a Group 15 atom, or a Group 16 atom; E is a substituted or unsubstituted monocyclic or polycyclic arenyl ligand pi-bonded to M at least one of A and E includes at least one halogen substituent directly bonded to an sp² carbon atom at a bondable ring position of the ligand; Y is an optional bridging group that is bonded to E and A, and is present when y is one and absent when y is zero; y is zero or one; and each X is a univalent anionic ligand, or two X are joined and bound to the metal atom to form a metallocycle ring, or two X are joined to form a chelating ligand, a diene ligand, or an alkylidene ligand.
 29. The compound of claim 28 wherein A contains an aromatic five-membered ring pi-bonded to M.
 30. The compound of claim 28 wherein A is a substituted or unsubstituted heterocyclopentadienyl ligand, a substituted or unsubstituted heteroindenyl ligand, a substituted or unsubstituted heterofluorenyl ligand, or a substituted or unsubstituted heterocyclopentanaphthyl ligand.
 31. The compound of claim 28 wherein said one or more ring heteroatoms of A is selected from boron, nitrogen, oxygen, phosphorus, and sulfur.
 32. The compound of claim 28 wherein A is selected from substituted and unsubstituted arsacyclopentadienyl ligands, substituted and unsubstituted azaboratabenzene ligands, substituted and unsubstituted azaborindenyl ligands, substituted and unsubstituted azaborollide ligands, substituted and unsubstituted azacyclopentadienyl ligands, substituted and unsubstituted benzothiaborollide ligands, substituted and unsubstituted boratabenzene ligands, substituted and unsubstituted boracyclopentadienyl ligands, substituted and unsubstituted cyclopentathienyl ligands, substituted and unsubstituted cyclopentabenzothienyl ligands, substituted and unsubstituted cyclopentafuryl ligands, substituted and unsubstituted cyclopentapyrrolyl ligands, substituted and unsubstituted cyclopentapyridyl ligands, substituted and unsubstituted cyclopentaphospholyl ligands, substituted and unsubstituted cyclopentaphosphinyl ligands, substituted and unsubstituted cyclopentaindolyl ligands, substituted and unsubstituted cyclopentaquinolyl ligands, substituted and unsubstituted indenodioxolyl ligands, substituted and unsubstituted indenothienyl ligands, substituted and unsubstituted indenopyridyl ligands, substituted and unsubstituted indenophosphinyl ligands, substituted and unsubstituted indenofuryl ligands, substituted and unsubstituted indenobenzothienyl ligands, substituted and unsubstituted indenoindolyl ligands, substituted and unsubstituted oxaborollide ligands, substituted and unsubstituted phosphaboratabenzene ligands, substituted and unsubstituted stibacyclopentadienyl ligands and substituted and unsubstituted thiaborollide ligands.
 33. The compound of claim 28 wherein A includes at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position.
 34. The compound of claim 28 wherein E is a substituted or unsubstituted cyclopentadienyl ligand, a substituted or unsubstituted indenyl ligand, a substituted or unsubstituted fluorenyl ligand, or a substituted or unsubstituted cyclopentanaphthyl ligand.
 35. The compound of claim 28 wherein E includes at least one halogen substituent directly bonded to any sp² carbon atom at a bondable ring position.
 36. The compound of claim 28 wherein Y is present and is a bridging group containing boron or a Group 14, 15 or 16 element.
 37. The compound of claim 28 wherein Y is present and is selected from R′₂C, R′₂Si, R′₂Ge, R′₂CCR′₂, R′₂CCR′₂CR′₂, R′₂CCR′₂CR′₂CR′₂, R′C═CR′, R′C═CR′CR′₂, R′₂CCR′═CR′CR′₂, R′C═CR′CR′═CR′, R′C═CR′CR′₂CR′₂, R′₂CSiR′₂, R′₂SiSiR′₂, R′₂CSiR′₂CR′₂, R′₂SiCR′₂SiR′₂, R′C═CR′SiR′₂, R′₂CGeR′₂, R′₂GeGeR′₂, R′₂CGeR′₂CR′₂, R′₂GeCR′₂GeR′₂, R′₂SiGeR′₂, R′C═CR′GeR′₂, R′B, R′₂C—BR′, R′₂C—BR′—CR′₂, R′N, R′P, O, S, Se, AsR′, SbR′, O—O, S—S, R′N—NR′, R′P—PR′, O—S, O—NR′, O—PR′, S—NR′, S—PR′, R′N—PR′, R′₂C—O—CR′₂, R′₂CR′₂C—O—CR′₂CR′₂, R′₂C—O—CR′₂CR′₂, R′₂C—O—CR′═CR′, R′₂C—S—CR′₂, R′₂CR′₂C—S—CR′₂CR′₂, R′₂C—S—CR′₂CR′₂, R′₂C—S—CR′═CR′, R′₂C—Se—CR′₂, R′₂CR′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′₂CR′₂, R′₂C—Se—CR′═CR′, R′₂C—N═CR′, R′₂C—NR′—CR′₂, R′₂C—NR′—CR′₂CR′₂, R′₂C—NR′—CR′═CR′, R′₂CR′₂C—NR′—CR′₂CR′₂, R′₂C—P═CR′, and R′₂C—PR′—CR′₂ where R′ is hydrogen or a C₁-C₂₀ containing hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl or germylcarbyl substituent and optionally two or more adjacent R′ may join to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic, cyclic or polycyclic substituent.
 38. The compound of claim 28 wherein Y is present and is selected from CH₂, CH₂CH₂, C(CH₃)₂, O, S, NPh, PPh, NMe, PMe, SiMe₂, SiPh₂, SiMePh, Si(CH₂)₃ and Si(CH₂)₄, where Me is methyl and Ph is phenyl.
 39. The compound of claim 28 wherein M is a Group 4 transition metal atom selected from titanium, zirconium or hafnium.
 40. The compound of claim 28 wherein the or each halogen substituent is a chloro, bromo or iodo substituent.
 41. The compound of claim 28 wherein the or each halogen substituent is a chloro or bromo substituent. 42.-70. (canceled)
 71. A metallocene compound selected from: (η⁵-3-bromo-5-methylcyclopenta[b]thienyl)(η⁵-pentamethylcyclopentadienyl) zirconium dichloride, rac-bis(η⁵-3-bromo-5-methylcyclopenta[b]thienyl)zirconium dichloride, meso-bis(η⁵-3-bromo-5-methylcyclopenta[b]thienyl)zirconium dichloride, rac-[dimethylsilanediyl-bis(η⁵-3-bromo-5-methylcyclopenta[b]thien-6-yl)](N¹,N³-diphenyl-1,3-propanediamido)zirconium, rac-dimethylsilanediyl-bis(η⁵-3-bromo-5-methylcyclopenta[b]thien-6-yl) zirconium dichloride, rac-[dimethylsilanediyl-bis(η⁵-3-bromo-2,5-dimethylcyclopenta[b]thien-6-yl)](N¹,N³-diphenyl-1,3-propanediamido)zirconium, rac-dimethylsilanediylbis(η⁵-3-bromo-2,5-dimethylcyclopenta[b]thien-6-yl) zirconium dichloride, dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,4-dimethyl-6-bromophenylamido))titanium dichloride, dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,6-dimethyl-4-bromophenylamido))titanium dichloride, dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,6-dimethyl-4-bromophenylamido))zirconium dichloride, dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,4-dimethyl-6-bromophenylamido))zirconium dichloride, dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,6-diisopropyl-4-bromophenylamido))titanium dichloride, dimethylsilanediyl(η⁵-4,5-dimethylcyclopenta[b]thien-6-yl)(N-(2,6-diisopropyl-4-bromophenylamido))zirconium dichloride, and rac-dimethylsilanediylbis(η⁵-3-bromo-4,5-dimethylcyclopenta[b]thien-6-yl)zirconium dichloride.
 72. A catalyst system comprising the metallocene compound of claim 1 and an activator.
 73. A process for polymerizing olefins comprising contacting the catalyst system of claim 72 with at least one olefin.
 74. The process of claim 73 wherein said at least one olefin comprises ethylene and/or propylene.
 75. A catalyst system comprising the metallocene compound of claim 8 and an activator.
 76. A process for polymerizing olefins comprising contacting the catalyst system of claim 75 with at least one olefin.
 77. The process of claim 76 wherein said at least one olefin comprises ethylene and/or propylene. 78.-80. (canceled)
 80. The process of claim 79 wherein said at least one olefin comprises ethylene and/or propylene.
 81. A catalyst system comprising the metallocene compound of claim 28 and an activator.
 82. A process for polymerizing olefins comprising contacting the catalyst system of claim 81 with at least one olefin.
 83. The process of claim 82 wherein said at least one olefin comprises ethylene and/or propylene. 84.-89. (canceled)
 90. A catalyst system comprising the metallocene compound of claim 71 and an activator.
 91. A process for polymerizing olefins comprising contacting the catalyst system of claim 90 with at least one olefin.
 92. The process of claim 91 wherein said at least one olefin comprises ethylene and/or propylene.
 93. The compound of claim 28, wherein y=0.
 94. The process of claim 82, wherein the activator is an alumoxane, N,N-dimethylanilinium tetrakis(perfluorophenyl)borate, N,N-dimethylanilinium tetrakis(perfluoronaphthyl)borate, N,N-dimethylanilinium tetrakis(perfluorobiphenyl)borate, N,N-dimethylanilinium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, triphenylcarbenium tetrakis(perfluoronaphthyl)borate, triphenylcarbenium tetrakis(perfluorobiphenyl)borate, triphenylcarbenium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, triphenylcarbenium tetra(perfluorophenyl)borate, or trispentafluorophenylborane.
 95. The catalyst system of claim 81, wherein the activator is an alumoxane, N,N-dimethylanilinium tetrakis(perfluorophenyl)borate, N,N-dimethylanilinium tetrakis(perfluoronaphthyl)borate, N,N-dimethylanilinium tetrakis(perfluorobiphenyl)borate, N,N-dimethylanilinium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, triphenylcarbenium tetrakis(perfluoronaphthyl)borate, triphenylcarbenium tetrakis(perfluorobiphenyl)borate, triphenylcarbenium tetrakis(3,5-bis(trifluoromethyl)phenyl)borate, triphenylcarbenium tetra(perfluorophenyl)borate, or trispentafluorophenylborane. 